Algebra Class Quiz on Sequences and Series
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Questions and Answers

Given the binomial expansion, what is the coefficient of the term T5?

  • 1120 (correct)
  • 16
  • 4
  • 70

In the given expression for T5, what is the exponent of 'x' after simplification?

  • 2
  • 8
  • 16
  • 4 (correct)

Which statement about the sequence 2, 6, 18, 54, 160,... is correct?

  • It is an arithmetic sequence.
  • It is not a geometric sequence because the last term is incorrect. (correct)
  • It is a geometric sequence with a common ratio of 4.
  • It is a geometric sequence with a common ratio of 3.

What is the common difference in the sequence x, 2x + y, 3x + 2y, ...?

<p>x + y (B)</p> Signup and view all the answers

Is the sequence x, 2x + y, 3x + 2y, ... an arithmetic progression?

<p>Yes, because the common difference is constant. (B)</p> Signup and view all the answers

In the arithmetic sequence 1, 5, 9, 13, 17, ..., what is the common difference?

<p>4 (A)</p> Signup and view all the answers

The sum of the first 10 terms of the arithmetic sequence 1, 5, 9, 13, 17,... is:

<p>190 (D)</p> Signup and view all the answers

Which of the given statements correctly identifies an arithmetic sequence?

<p>x, 2x + y, 3x + 2y,... (B)</p> Signup and view all the answers

Using the given values, what is the correct sum of the arithmetic sequence?

<p>190 (C)</p> Signup and view all the answers

If the formula for the sum of an arithmetic sequence is $S_n = \frac{n}{2}[2a_1 + (n - 1)d]$, what does $a_1$ represent?

<p>The first term in the sequence (D)</p> Signup and view all the answers

How many distinct arrangements are possible for the letters in the word 'PUPIAN'?

<p>360 ways (D)</p> Signup and view all the answers

What is the key concept used to solve the arrangement problem of the word 'PUPIAN'?

<p>Permutation with repetition (C)</p> Signup and view all the answers

What is the correct formula for simple interest?

<p>$I = PRT$ (C)</p> Signup and view all the answers

If an investment of $70,000 earns $15,000 in interest at a 3.8% annual rate, what is the time it took in years?

<p>5.64 years (B)</p> Signup and view all the answers

In the simple interest formula, if the interest (I) and the time (T) are constant, how does the principal (P) affect the interest rate (R)?

<p>As P increases, R decreases (D)</p> Signup and view all the answers

What is the decimal form of 3.8%?

<p>0.038 (C)</p> Signup and view all the answers

A right triangle has sides of length 9 and 40. What is the area of the triangle?

<p>180 (D)</p> Signup and view all the answers

Jandrik travels 15 km west and then 36 km south. What is the straight-line distance in kilometers from his starting position?

<p>39 (D)</p> Signup and view all the answers

If $a$ and $b$ are real numbers such that $a + b = 15$ and $ab = 45$, what is the value of $a^2 + b^2$?

<p>135 (A)</p> Signup and view all the answers

An isosceles right triangle has a leg length greater or equal to 13 cm. What is the minimum possible area of this triangle?

<p>84.5 sq.cm. (D)</p> Signup and view all the answers

There are 4 distinct Model A cars and 4 distinct Model B cars. If they are arranged in a row such that no two cars of the same model are adjacent, how many possible arrangements are there?

<p>1152 (A)</p> Signup and view all the answers

A line segment is drawn from the center of a polygon perpendicular to one of its sides. What is this line segment called?

<p>Apothem (D)</p> Signup and view all the answers

What is the result of 1/2 * 9 * 40?

<p>180 (D)</p> Signup and view all the answers

Given that $\sqrt{15^2+36^2}= x$, what is value of $x$?

<p>39 (B)</p> Signup and view all the answers

Seph invests a total of Php 500,000 in two businesses, a computer shop and a coffee shop. If the computer shop yields 5% monthly interest and the coffee shop yields 3%, how much should be invested in each to earn Php 18,000 monthly?

<p>Computer shop: Php 150,000, Coffee shop: Php 350,000 (C)</p> Signup and view all the answers

In the given problem, if 'x' represents the amount invested in the computer shop and 'y' represents the amount invested in the coffee shop, which equation represents the total monthly interest earned?

<p>$0.05x + 0.03y = 18,000$ (A)</p> Signup and view all the answers

Based on the problem, what is the first step in solving for the amount invested in each business using the system of linear equations?

<p>Solving for 'y' in terms of 'x' in the first equation. (A)</p> Signup and view all the answers

After substituting the value of 'y' in the second equation, how is the value of 'x' determined?

<p>By dividing both sides by $0.02$. (B)</p> Signup and view all the answers

What does the equation x + y = 500,000 represent in the context of Seph's investments?

<p>The total amount invested in both businesses. (C)</p> Signup and view all the answers

If Seph had invested Php 100,000 more in the computer shop, what would be the new value of x, given that the total investment remains at Php 500,000?

<p>Php 250,000 (C)</p> Signup and view all the answers

In the step 0.05x + 15,000 - 0.03 = 18,000, how is the value 15,000 derived?

<p>By multiplying 0.03 by 500,000. (C)</p> Signup and view all the answers

What is the purpose of using the subtraction property of equality in the solution?

<p>To isolate y by subtracting x from both sides of the equation. (B)</p> Signup and view all the answers

Which of the following sets of numbers does NOT represent a Pythagorean triple?

<p>7-21-22 (A)</p> Signup and view all the answers

Given a right triangle in the second quadrant where sin θ = $\frac{7}{25}$, what is the value of sec θ?

<p>-$\frac{25}{24}$ (A)</p> Signup and view all the answers

A piggy bank contains 35 coins in total, consisting of 10-centavo and 25-centavo coins. If the total value of the coins is P5.90, how many 10-centavo coins are in the piggy bank?

<p>19 (D)</p> Signup and view all the answers

If a right triangle has a sine value of $\frac{7}{25}$ and is located in the second quadrant, what is the value of tan θ?

<p>$-\frac{7}{24}$ (D)</p> Signup and view all the answers

Given a right triangle with sin θ = $\frac{7}{25}$, what is the length of the side adjacent to angle θ?

<p>24 (C)</p> Signup and view all the answers

If a piggy bank has P5.90 consisting of 10 and 25-centavo coins, and the total number of coins is 35, what is the total value of the 25-centavo coins?

<p>P 4.00 (D)</p> Signup and view all the answers

What is the value of cos θ if sin θ = $\frac{7}{25}$ and the triangle is in the second quadrant?

<p>$-\frac{24}{25}$ (A)</p> Signup and view all the answers

In the context of Pythagorean triples, if 'a' is an odd number, how are 'b' and 'c' typically related?

<p>b and c are consecutive numbers (B)</p> Signup and view all the answers

What is the area of a triangle with side lengths 13, 14, and 15?

<p>84 (A)</p> Signup and view all the answers

A triangle has an area of 84, with a semi-perimeter of 21. What is the radius of the inscribed circle?

<p>4 (A)</p> Signup and view all the answers

If $z = 2 + 3i$, what is the magnitude of $z^2$, denoted as $|z^2|$?

<p>13 (D)</p> Signup and view all the answers

How many diagonals does a regular icosagon have?

<p>170 (A)</p> Signup and view all the answers

Given a random variable X following a uniform distribution on the interval [0,10], what is the probability that $3 < X < 7$?

<p>0.4 (B)</p> Signup and view all the answers

What is the semi-perimeter of a triangle with sides of length 13, 14, and 15?

<p>21 (B)</p> Signup and view all the answers

What is the value of $i^2$?

<p>-1 (B)</p> Signup and view all the answers

Which of the following formulas is used to calculate the number of diagonals in a polygon?

<p>$D = \frac{n(n-3)}{2}$ (D)</p> Signup and view all the answers

Flashcards

Linear Equation

A mathematical statement that represents a relationship between two or more variables, where each variable is raised to the power of one.

System of Linear Equations

A set of two or more linear equations that share a common solution.

Solving for a Variable

The process of finding the value of a variable in an equation by using the properties of equality to isolate the variable.

Substitution Method

Substituting the value of one variable in terms of another into an equation to eliminate one variable.

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Monthly Interest

The process of finding the total interest earned on an investment, calculated as a percentage of the principal amount, usually on a monthly basis.

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Principal Amount

The amount of money invested in a business or project.

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Interest Earned

The amount of money earned from investments over time.

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High-Yield Investment

A type of investment that yields higher returns compared to others, typically due to higher risk.

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Geometric Sequence

A sequence where each term is found by multiplying the previous term by a constant value called the common ratio.

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Arithmetic Sequence

A sequence where each term is found by adding a constant value called the common difference to the previous term.

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Arithmetic Series

A sequence where the difference between consecutive terms is constant.

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Sum of Arithmetic Series

The sum of the terms in an arithmetic series.

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Arithmetic Series Formula

A formula used to calculate the sum of the first n terms of an arithmetic series.

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Common Ratio

The value that is multiplied by the previous term to get the current term in a geometric sequence.

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Common Difference

The value that is added to the previous term to get the current term in an arithmetic sequence.

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nth Term Formula (Arithmetic)

A formula used to calculate the nth term of an arithmetic sequence.

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Permutation

A sequence of letters or symbols that can be arranged in different orders.

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Simple Interest

The interest earned on the principal amount only.

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Sn = [2a1 + (n-1)d]/2

The formula used to calculate the sum (Sn) of an arithmetic series.

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n! / (n1!n2!n3!...

The formula used to calculate the number of arrangements when repetition of elements is allowed.

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a1

The value of the first term in an arithmetic series.

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d

The common difference between consecutive terms in an arithmetic series.

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n

The number of terms in a sequence or series.

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Area of a Right Triangle

The area of a right triangle can be calculated by multiplying half the base and the height.

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Distance Formula

To find the distance between two points, use the Pythagorean theorem: √(change in x)² + (change in y)²

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Squaring the Sum

Squaring the sum of two numbers is equal to the sum of their squares plus twice their product.

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Area of Isosceles Right-Angled Triangle

The area of an isosceles right-angled triangle is half the product of its equal sides.

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Arrangements of Two Sets

Two separate sets of items, each with a fixed number of elements, have several ways to arrange themselves. The arrangements are calculated by multiplying the factorials of the number of items in each set together.

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Apothem

A line segment from the center of a polygon to the midpoint of a side, perpendicular to that side.

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Incircle Radius Formula

The radius of the inscribed circle in a triangle is calculated by dividing the area of the triangle by its semi-perimeter.

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Magnitude of a Complex Number

The magnitude of a complex number z is the distance from the origin (0, 0) to the point representing z in the complex plane.

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Icosagon

A polygon with 20 sides is called an icosagon.

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Number of Diagonals in a Polygon

The formula for the number of diagonals in an n-sided polygon is n(n-3)/2.

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Uniform Distribution

A uniform distribution is characterized by a constant probability density over a given interval. The probability of a uniform random variable falling within a subinterval is directly proportional to the length of that subinterval.

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Squaring a Complex Number

The square of a complex number z, denoted as z^2, is obtained by multiplying z by itself.

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Absolute Value of a Complex Number

The absolute value of a complex number, denoted as |z|, is calculated using the formula: |z| = √(a^2 + b^2), where z = a + bi.

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Heron's Formula

Heron's formula provides a method to calculate the area of a triangle using its side lengths.

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Pythagorean Triple

A set of three positive integers that satisfy the Pythagorean Theorem (a² + b² = c²), where 'c' is the hypotenuse of a right triangle.

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Secant (sec θ)

The ratio of the hypotenuse to the adjacent side of a right triangle.

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Sine (sin θ)

The trigonometric function that represents the ratio of the opposite side to the hypotenuse in a right triangle.

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Pythagorean Theorem

A mathematical statement that represents the relationship between the sides of a right triangle, where the sum of the squares of the two shorter sides (a and b) equals the square of the longest side (c), the hypotenuse. a² + b² = c².

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Study Notes

PUPCET 2025 Mock Exam - Mathematics

  • Mathematics exam for PUP (Philippine University of the Philippines) students
  • Prepared by the Public Information and Affairs Committee, Academic and Research Committee, and Volunteers
  • Exam questions cover Systems of Linear Equations (Grade 8) and Arithmetic Sequences.

Question 1 - Investment Decisions

  • Seph invests Php 500,000 in a computer shop (5% monthly interest) and a coffee shop (3% monthly interest)
  • He wants a total monthly interest of Php 18,000
  • Correct answer: Computer shop: Php 150,000, Coffee shop: Php 350,000

Question 2 - Arithmetic Sequence

  • Fourth term of an arithmetic sequence is 2
  • Seventeenth term is 7
  • Determine the general term of the sequence
  • Correct answer: an = 5n+6 / 13

Question 3 - Binomial Expansion

  • Find the fifth term in the expansion of (2x + y)8
  • Correct answer: 1120x4y4

Question 4 - True/False Statements

  • Statement 1: 2, 6, 18, 54, 160 is a geometric sequence => False
  • Statement 2: x, 2x + y, 3x + 2y... is an arithmetic sequence => True
  • Statement 3: 1, 5, 9, 13, 17... The sum of the first 10 terms is 175 => False

Question 5 - Letter Arrangement

  • Determine the number of ways to arrange the letters in the word PUPIAN
  • Correct answer: 360 ways

Question 6 - Simple Interest

  • Mx. Cruz wants to earn Php 15,000 in interest on a PHP 70,000 investment at 3.8% annual interest
  • Determine the time length needed to reach the goal
  • Correct answer: 5.64 years

Question 7 - Equation of a Line

  • Determine the slope-intercept form of a line passing through (5, 4) and (6, 9)
  • Correct answer: y=5x-21

Question 8 - Compound Interest

  • Joshua invests Php 14,300 at a 6% interest rate compounded monthly for 4 years
  • How much money will Joshua have?
  • Correct answer: Php 18,167.99

Question 9 - Consecutive Odd Integers

  • Find three consecutive odd integers.
  • Sum of the smallest and largest: 62. Sum of all three: 93
  • Correct answer: 29, 31, and 33

Question 10 - Normal Distribution

  • In normal distribution, the mean, median, and mode are all equal and located at the center of the spread.

Question 11 - Number Pattern

  • Determine the missing number in the sequence 1, 2, 7, 34, 203, 1420, …
  • Correct answer: 11359

Question 12 - Divisible Polynomials

  • Given the polynomial 2x4 - 9x3 + mn2 + nx + 54 = 0 is divisible by x2 + 4x + 3
  • Find m+n
  • Correct answer: -23

Question 13 - Factorization

  • Factorize 4x² - 4y² + 40x - 28y + 51
  • Correct answer: (2x+2y + 17)(2x -2y+3)

Question 14 - Positive Factors

  • Find the sum of all positive factors of 756
  • Correct answer : 2240

Question 15 - Intersection of Lines

  • Find the point of intersection of line A: y = 4x + 8 and line B: y = 7x + 5
  • Correct answer: (1,12)

Question 16 - Area

  • Find the area of a triangle with side lengths 9, 40, and 41
  • Correct answer: 180

Question 17 - Positional Change

  • Determine the distance between an original position after going 15 km west then 36 km south
  • Correct answer : 39

Question 18 - Algebraic Calculation

  • Given 'a' + 'b' = 15 and ab = 45, find a² + b²
  • Correct answer: 135

Question 19 - Right Angled Triangle

  • Given ∆ABC, find the minimum value of its area , where dist(B,C) >= 13cm and ∠ACB= 90°
  • Correct answer: 84.5 cm2

Question 20 - Arrangement and Models (Permutation)

  • Determine the arrangements of 4 models of type A and 4 models of type B when they cannot be placed next to each other, lining up in a row.
  • Correct answer: 1152

Question 21 - Line Segment

  • Identify the geometric term for a line segment drawn from the center of a polygon perpendicular to a side.
  • Correct answer: Apothem

Question 22 - Pythagorean Triples

  • Which is not a Pythagorean Triple?
  • Correct answer: 7-21-22

Question 23 - Trigonometry in Second Quadrant

  • Given sin θ = 7/25 in the second quadrant, determine sec θ
  • Correct answer: -25/24

Question 24 - Coin Values

  • Determine the number of 10-centavo and 25-centavo coins in a piggy bank.
  • There are 35 coins with a total value of P5.90
  • Correct answer: Nineteen 10-centavo coins and sixteen 25-centavo coins

Question 25 - Reciprocal Difference

  • Find the two positive numbers given their reciprocal difference and one is 3 times the other.
  • Correct answer: 4 and 12

Question 26 - Age Problem

  • Heather's age. One-half of her age in two years plus one-third of her age three years ago is 20.
  • Correct answer : 24

Question 27 - Mixture of Rice

  • Find the kg of rice that sells for P10 per kilo to mix with rice that sells for P7.50 to make a 100-kilo mixture that sells for P8.50.
  • Correct answer: 40

Question 28 - Travel Time and Displacement

  • Ji leaves home for PUP Exam at 12 mph. 20 minutes later her mother brings his test permit. Mother drives at 36 mph.
  • Correct answer: 6 miles

Question 29 - Probability of Fire Occurrence

  • Given the probability of dangerous fires and the probability of fires producing smoke.
  • Calculate the probability that a fire occurs when there is smoke
  • Correct answer: 0.09

Question 30 - Meal Option Combination

  • Calculate the possible number of meals offered with specified choices for side item, juice, and pasta.
  • Correct answer: 32

Question 31 - Polynomial Roots

  • Find the roots of the polynomial
  • x³ — 6x² — 11x + 6 = 0
  • Correct Answer: x = 1, 2, 3.

Question 32 - Logarithmic Equations

  • Solve for x in the logarithmic equation log₃(x − 1) + log₃(x + 1) = 2
  • Correct answer: √10

Question 33 - Radius of Inscribed Circle

  • Find the radius of the circle inscribed in a triangle with sides 13, 14, and 15.
  • Correct answer: 6

Question 34 - Complex Number

  • Find the magnitude of z^2 if z = 2 + 3i
  • Correct answer: 13

Question 35 - Diagonals in a Regular Polygon

  • Find the number of diagonals in an icosagon
  • Correct answer: 170

Question 36 - Uniform Distribution

  • Given a uniform distribution X on [0,10], find P(3 < X < 7)
  • Correct answer: 0.4

Question 37 - Poisson Distribution

  • Given X ~ Poisson(λ = 4), find the variance
  • Correct answer: 4

Question 38 - Standard Deviation Scaling

  • If the standard deviation of a dataset is 10, and every value is multiplied by 5, what is the new standard deviation?
  • Correct answer: 50

Question 39 - Probability of Union

  • Find P(A∪B) given P(A) = 0.4, P(B) = 0.6, P(A∩B) = 0.2
  • Correct answer: 0.8

Question 40 - Geometric Distribution

  • In a geometric distribution with p = 0.25, find the probability of the first success occurring on the 4th trial.
  • Correct answer: 0.140625

Question 41 - Project Completion Time

  • Sarah completes a project in 20 days and David completes the same project in 15 days. If they work together, how many days will it take to complete the project?
  • Correct answer: 60/7 days

Question 42 - Rocket Distance

  • What distance does a rocket traveling at 3 miles per second cover in 1 hour?
  • Correct answer: 10,800 miles

Question 43 - Irrational Numbers

  • Which of the following is NOT an irrational number?
  • Correct answer: 7/3

Question 44- Two-Digit Numbers

  • If 't' is the tens digit and 'u' is the units digit of a two-digit number, which expression represents the number?
  • Correct answer: 10t + u

Question 45 - Age Calculation

  • Jack is four years older than Jill. Three years ago, Jack's age was two years less than twice Jill's age. What is the equation to find Jill's current age?
  • Correct answer: 2(x - 3) - 2 = x + 1

Question 46 - Approximation

  • Estimate the value of 0.889 × 55 / 9.97
  • Correct answer: 4.9

Question 47 - Sphere in Cube

  • Find the volume of the largest sphere that can fit inside a cube with a volume of 216 cm³.
  • Correct answer: 36Ï€ cm³

Question 48 - Lines Intersection

  • Determine the point of intersection of Line A (y = 4x + 8) and Line B (y = 7x + 5)
  • Correct answer: (1,12)

Question 49 - Algebraic Simplification

  • Simplify the expression √256/(x² - 4) if x = 4
  • Correct answer: 2

Question 50 - Fraction of Money Spent

  • Kelly spent half her money on a DVD and 1/6 on popcorn. What fraction of her money did she spend in total?
  • Correct answer: 2/3

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