Algebra Class: Interest and Exponents
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Questions and Answers

What is the principal for the second year (P2)?

  • 23328
  • 21600 + 1600
  • 21600
  • 21600 + 1728 (correct)
  • What is the value of SI2, the simple interest earned in the second year?

  • 1600
  • 3328
  • 1728 (correct)
  • 23328
  • What is the total interest earned over the two years?

  • 3328 (correct)
  • 1600
  • 23328
  • 1728
  • What type of algebraic expression is 21600 + 1728?

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

    What is the variable in the expression 21600 × 8 / 100?

    <p>None of the above (D)</p> Signup and view all the answers

    What is the value of the expression 21600 × 8 / 100?

    <p>1600 (C)</p> Signup and view all the answers

    What is the total amount to be paid at the end of the second year?

    <p>23328 (C)</p> Signup and view all the answers

    Which expression represents the total interest earned over the two years?

    <p>1600 + 1728 (D)</p> Signup and view all the answers

    According to the content, what is the area of the triangle ABC?

    <p>150 cm2 (D)</p> Signup and view all the answers

    Which of the following is the correct expression for x raised to the power of 10 divided by x raised to the power of 5, according to the laws of exponents?

    <p>x5 (B)</p> Signup and view all the answers

    What is the value of x^0, based on the laws of exponents?

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

    How do you express the number 0.0000000016 in standard form?

    <p>1.6 x 10^-9 (A)</p> Signup and view all the answers

    What is the simplified form of (x^3)^2?

    <p>x^6 (D)</p> Signup and view all the answers

    Which of the following expressions is equivalent to x^4 * x^3 * x^2?

    <p>x^9 (A)</p> Signup and view all the answers

    What is the value of (2^3)^2?

    <p>64 (A)</p> Signup and view all the answers

    Which of the following is a correct representation of the number 1,500,000,000 in standard form?

    <p>1.5 x 10^9 (A)</p> Signup and view all the answers

    What is the formula for calculating the amount when interest is compounded annually?

    <p>A = P(1 + (R/100))^n (A)</p> Signup and view all the answers

    What is the formula for calculating the compound interest (CI) when interest is compounded annually?

    <p>CI = P(1 + (R/100))^n - P (C)</p> Signup and view all the answers

    What is the formula for calculating the amount when interest is compounded half-yearly?

    <p>A = P(1 + (R/(2<em>100)))^(2</em>n) (D)</p> Signup and view all the answers

    What is the formula for calculating the compound interest (CI) when interest is compounded half-yearly?

    <p>CI = P(1 + (R/(2<em>100)))^(2</em>n) - P (A)</p> Signup and view all the answers

    If the interest rate changes every year, what is the formula for calculating the amount?

    <p>A = P(1 + (R1/100))(1 + (R2/100))(1 + (R3/100)) (D)</p> Signup and view all the answers

    If the interest rate changes every year, what is the formula for calculating the compound interest (CI)?

    <p>CI = P(1 + (R1/100))(1 + (R2/100))(1 + (R3/100)) - P (A)</p> Signup and view all the answers

    A sum of `20,000 is borrowed at an interest rate of 8% compounded annually for 2 years. What is the amount to be paid at the end of 2 years?

    <p>23328 (D)</p> Signup and view all the answers

    In the example provided, what is the compound interest (CI) for the first year?

    <p>800 (A)</p> Signup and view all the answers

    What is the first step in finding the height of the tree in the example given in the text?

    <p>Form a table with the height of the object and the length of its shadow. (D)</p> Signup and view all the answers

    Why is the table formed in the example important?

    <p>It helps to visually organize the given information and the unknown. (B)</p> Signup and view all the answers

    In the solution, what is the significance of the equation $14/10 = x/15$?

    <p>It expresses the proportionality between the height of the object and the length of its shadow. (D)</p> Signup and view all the answers

    Which of the following best describes the term 'factorization' as defined in the text?

    <p>Expressing an expression as a product of two or more expressions. (A)</p> Signup and view all the answers

    What is a 'common monomial factor' in the context of factorization?

    <p>A factor that is common to all terms in a polynomial expression. (C)</p> Signup and view all the answers

    Which of the following is an example of a binomial?

    <p>$5x + 2$ (A)</p> Signup and view all the answers

    What is the greatest common factor of the terms $6x^2$ and $12x$?

    <p>$6x$ (A)</p> Signup and view all the answers

    In the text, what is the primary focus of the section labelled 'Let’s Revise'?

    <p>Providing a summary of key concepts and definitions related to factorization. (C)</p> Signup and view all the answers

    What is the ones digit of a number that is divisible by 2?

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

    Which of the following numbers is divisible by 3?

    <p>9876 (D)</p> Signup and view all the answers

    Which of the following operations are whole numbers closed under?

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

    Under which operation are integers NOT closed?

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

    Which of the following is a valid representation of a 3-digit number in terms of its hundreds, tens, and ones digits?

    <p>100a + 10b + c (D)</p> Signup and view all the answers

    Which of the following operations are rational numbers closed under?

    <p>Addition, Subtraction, and Multiplication (A)</p> Signup and view all the answers

    What is the divisibility rule for 10?

    <p>The last digit must be 0. (C)</p> Signup and view all the answers

    What does the denominator of a rational number represent?

    <p>The total number of equal parts the whole unit is divided into (D)</p> Signup and view all the answers

    Which of the following statements about closure property is true?

    <p>If a set is closed under an operation, performing that operation on any two elements from the set always results in an element within the set. (C)</p> Signup and view all the answers

    What is the result of the following operation: (\frac{3}{5} \div \frac{2}{3})

    <p>(\frac{9}{10}) (A)</p> Signup and view all the answers

    Given the following: (\frac{-3}{5} + \frac{2}{5}), which of the following statements is true?

    <p>The sum is a rational number, (\frac{-1}{5}) (B)</p> Signup and view all the answers

    Flashcards

    Denominator

    Indicates how many equal parts the unit is divided into.

    Numerator

    Indicates how many parts are to be considered from the whole.

    Closure property

    A set is closed under an operation if performing that operation on members always produces a member of the same set.

    Whole Numbers closure under addition

    Whole numbers are closed under addition; results are still whole numbers.

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    Integers closure under subtraction

    Integers are closed under subtraction; results remain integers.

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    Rational Numbers closure under addition

    Rational numbers are closed under addition; the result is still rational.

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    Rational Numbers closure under division

    Rational numbers are not closed under division by zero but are closed when zero is excluded.

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    Commutative property of addition

    Whole numbers are commutative under addition; order doesn't matter.

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    Principal (P1)

    The initial amount of money before interest is applied.

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    Simple Interest (SI)

    Interest calculated on the principal amount, not on the interest accrued.

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    Amount at end of year 1

    Total amount after adding simple interest for the first year to principal.

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    Monomial

    An algebraic expression with one term.

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    Binomial

    An algebraic expression with two terms.

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    Like Terms

    Terms in an expression that have the same variable raised to the same power.

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    Multiplying Polynomials

    Distributing every term of one polynomial to every term of another.

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    Trinomial

    An algebraic expression with three terms.

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    Height of Object

    The height of an object casting a shadow, measured in meters.

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    Length of Shadow

    The distance a shadow extends from the base of an object, measured in meters.

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    Similar Triangles

    Two triangles that have the same shape but may differ in size; their corresponding angles are equal.

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    Factorization

    The process of writing an expression as a product of its factors.

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    Greatest Common Factor (GCF)

    The largest factor that two or more numbers have in common.

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    Monomial Factor

    A single term algebraic expression that can be part of a larger expression.

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    Binomial Factor

    An algebraic expression that includes two terms.

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    Algebraic Expression

    A mathematical phrase that includes numbers, variables, and operation symbols but no equals sign.

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    Compound Interest Formula

    CI = Amount - Principal.

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    Compounded Annually

    A = P (1 + R/100)^n, where P is principal, R is rate, and n is time.

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    Compounded Half-Yearly

    A = P (1 + R/200)^(2n), using half the rate for two periods in a year.

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    Different Rates for Different Years

    A = P(1 + R1/100)(1 + R2/100)(1 + R3/100) for varying interest rates.

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    Amount After 2 Years

    Total amount paid back after interest is applied over 2 years.

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    Principal in Second Year

    The amount used to calculate interest in the second year, including first year gains.

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    Simple Interest in One Year

    S.I. = (Principal * Rate * Time)/100; simple calculation for initial interest.

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    C.I. Calculation Process

    Find S.I., update Principal, recalculate for additional years.

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    Area of Triangle

    Area = ½ × base × height; formula used to calculate triangle's area.

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    Negative Exponents Rule (Multiplication)

    x^m × x^n = x^(m+n); adds exponents when multiplying like bases.

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    Negative Exponents Rule (Division)

    x^m ÷ x^n = x^(m-n); subtracts exponents when dividing like bases.

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    Zero Exponent Rule

    Any number raised to the power of zero equals one; x^0 = 1.

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    Standard Form Definition

    A number in standard form is expressed as a product of a number between 1 and 10 and a power of 10.

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    Standard Form Example

    Example: 149600000000 = 1.496 × 10^11; representation of numbers in standard form.

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    Very Small Numbers in Standard Form

    Small numbers can also be expressed in standard form using negative exponents; e.g., 0.0016 = 1.6 × 10^–3.

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    Law of Exponents

    Various rules to simplify expressions involving exponents; includes multiplication, division, power of a power, etc.

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    Two-digit number

    A number in the form of 10a + b, where a is from 1-9 and b is from 0-9.

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    Three-digit number

    A number in the form of 100a + 10b + c, where a is from 1-9, b and c are from 0-9.

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    Divisibility by 2

    A number is divisible by 2 if its unit digit is even.

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    Divisibility by 3

    A number is divisible by 3 if the sum of its digits is divisible by 3.

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    Divisibility by 5

    A number is divisible by 5 if its unit digit is 0 or 5.

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    Divisibility by 10

    A number is divisible by 10 if its unit digit is zero.

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    Divisibility by 9

    A number is divisible by 9 if the sum of its digits is divisible by 9.

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    Divisibility by 4

    A number is divisible by 4 if the number formed by its last two digits is divisible by 4.

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    Study Notes

    Rational Numbers

    • Rational numbers can be expressed in the form p/q, where p and q are integers and q is not zero.
    • Examples include 1/2, 3, -5/7, 0.
    • All whole numbers and integers are rational numbers.
    • Rational numbers are closed under addition, subtraction, and multiplication.
    • Division by zero is not defined for rational numbers.

    Properties of Numbers

    • Closure: Whole numbers are closed under addition and multiplication. They are not closed under subtraction and division. Integers are closed under addition, subtraction and multiplication. They are not closed under division. Rational numbers are closed under addition and multiplication. But they are NOT closed under division; division by zero is not defined.
    • Commutativity: Whole numbers are commutative under addition and multiplication. Integers and rational numbers are also commutative under addition and multiplication.
    • Associativity: Whole numbers are associative under addition and multiplication. Integers and rational numbers are associative under addition and multiplication.
    • Distributivity: Multiplication distributes over addition for whole numbers, integers, and rational numbers.

    Linear Equations in One Variable

    • An equation is a statement of equality.
    • A linear equation in one variable is of the form ax + b = 0, where 'x' is the variable and 'a' and 'b' are constants (a≠0).
    • Solving an equation means finding the value of the variable that makes the equation true.
    • Transposing a term from one side of the equation to the other side changes its sign.

    Understanding Quadrilaterals

    • A polygon is a closed two-dimensional shape formed by line segments.
    • A quadrilateral is a polygon with four sides.
    • Convex polygons have all interior angles less than 180 degrees.
    • Concave polygons have at least one interior angle greater than 180 degrees.
    • Regular polygons have equal sides and angles, and irregular polygons have unequal sides and angles.
    • The sum of interior angles of a polygon with 'n' sides is (n-2) x 180 degrees.
    • The sum of exterior angles of a polygon is 360 degrees.
    • Special quadrilaterals include parallelograms, rectangles, squares, rhombuses, and kites, each with specific properties concerning sides, angles, and diagonals.

    Data Handling

    • Data: Numerical observations.
    • Frequency: The number of times an observation occurs.
    • Frequency distribution: A table showing observations and their frequencies.
    • Range: The difference between the highest and lowest observations.
    • Class mark: The midpoint of a class interval.
    • Histogram: A bar graph representing data in intervals.
    • Pie chart: A circular graph showing data as proportions.
    • Probability: The likelihood of an event occurring, always between 0 and 1.

    Squares and Square Roots

    • Square of n = n x n = n²
    • A perfect square is a number which is the square of an integer.
    • Finding the square root of a number is the inverse operation to squaring.
    • √n represents the square root of n.
    • Properties of squares—even/odd, ending in certain digits.

    Cubes and Cube Roots

    • Cube of n = n x n x n = n³
    • A perfect cube is a number which is the cube of an integer.
    • Finding the cube root of a number is the inverse operation to cubing.
    • ∛n represents the cube root of n.
    • Properties of cubes—(even/odd and ending in certain digits).

    Comparing Quantities

    • Discount = Marked Price - Selling Price
    • Additional expenses = overhead expenses
    • Sales tax: Tax % on bill amount
    • VAT: Tax on selling price of an article
    • Percent: Per hundred (hundredths)

    Exponents and Powers

    • Exponents represent repeated multiplications
    • Laws of exponents.

    Direct and Inverse Proportions

    • Direct proportion: When one quantity increases, the other quantity increases proportionally.
    • The ratio is constant
    • Inverse Proportion: When one quantity increases, the other decreases proportionally.
    • The product is constant
    • The values can be found for unknown amounts in the equation

    Factorization

    • Factorization: Writing an expression as a product of factors.
    • Greatest common factor(GCF): The largest number that divides all the terms.
    • Factoring Binomials—Difference of Squares, perfect square trinomial (sum/difference)
    • Common factors in polynomials
    • Division of Polynomials: (remainder theorem)

    Introduction to Graphs

    • Coordinates on a plane (x and y axis).
    • Origin (0,0)
    • Bar graphs, Pie graphs, histograms, line graphs
    • Plotting points and relations using graphs

    Mensuration

    • Perimeter, area of rectangles, squares, triangles, and quadrilaterals
    • Area and circumference.
    • Volume of cuboids and cubes
    • Areas and volumes of other 3D shapes
    • Relationship between angles and sides in shapes
    • Area and perimeter formulas, calculation of unknown values, etc.

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    Description

    This quiz covers key algebra topics including the calculation of simple interest over two years and the laws of exponents. Test your understanding of expressions, variables, and various calculations from the algebra curriculum. Perfect for students looking to reinforce their knowledge.

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