Exponents and Expressions Quiz

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Questions and Answers

What is the value of $4^3$?

  • 12
  • 81
  • 16
  • 64 (correct)

Which expression represents 'a raised to the power of 5'?

  • $a \times 5$
  • $5a$
  • $a + a + a + a + a$
  • $a^5$ (correct)

In the expression $7^4$, which number is the base?

  • 4
  • 28
  • 7 (correct)
  • 11

What does the expression $(-3)^2$ equal?

<p>9 (C)</p> Signup and view all the answers

Which of the following is equivalent to $3^2 \times 2^3$?

<p>72 (A)</p> Signup and view all the answers

Which of these is the correct exponential representation of 64 as a power of 4?

<p>$4^3$ (B)</p> Signup and view all the answers

How can the expression $a \times a \times b \times b \times b$ be written in exponential form?

<p>$a^2b^3$ (B)</p> Signup and view all the answers

What is the value of $4^2$ + $2^3$?

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

Which of the following describes how the expression $5x^2 - 3$ is formed?

<p>Square x, then multiply by 5, and subtract 3. (D)</p> Signup and view all the answers

What is the correct way to describe how the expression $2ab + 5$ is formed?

<p>Multiply a by b, then multiply the result by 2, and add 5. (D)</p> Signup and view all the answers

How should we describe the formation of the expression $x^3$?

<p>Multiply x by itself twice. (B)</p> Signup and view all the answers

Which of these correctly explains how the expression $3x^2 - 5x$ is formed?

<p>Square x, multiply by 3, then subtract x multiplied by 5. (A)</p> Signup and view all the answers

What is the first operation performed to form the expression $10y - 20$?

<p>Multiply y by 10. (C)</p> Signup and view all the answers

What operation is used to obtain the term $xy$?

<p>Multiply x by y. (C)</p> Signup and view all the answers

How is the expression $4xy + 7$ formed?

<p>Multiply x by y, then multiply the result by 4, and then add 7. (C)</p> Signup and view all the answers

Which of the expressions is formed by first multiplying a variable by itself and then multiplying this result by 2?

<p>$2x^2$ (D)</p> Signup and view all the answers

Which of the following correctly represents the expansion of the term $a^4$?

<p>$a \times a \times a \times a$ (C)</p> Signup and view all the answers

What is the numerical coefficient of the term $-12pqr$?

<p>$-12$ (C)</p> Signup and view all the answers

In the term $7ab^2$, what is the coefficient of $b^2$?

<p>$7a$ (A)</p> Signup and view all the answers

If a term has a coefficient of '$-1$', how is it typically written?

<p>Using only a minus sign (C)</p> Signup and view all the answers

What is the coefficient of $x$ in the term $x$?

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

In the expression $9jkl$, what is the coefficient of $9l$?

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

Which of the following is the correct way to express the term $y \times y \times y$, using exponents?

<p>$y^3$ (D)</p> Signup and view all the answers

In the term $15p^2q$, what is the coefficient of $15q$?

<p>$p^2$ (D)</p> Signup and view all the answers

In the expression $13 - y + 5y^2$, what is the numerical coefficient of the term $-y$?

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

What is the numerical coefficient of the term $4p^2q$ in the expression $4p^2q - 3pq^2 + 5$?

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

In the expression $4x - 3y$, what is the coefficient of $x$?

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

What is the coefficient of $y$ in the expression $8 + yz$?

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

In the expression $my + m$, what is the coefficient of $y$?

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

Which of the following terms are like terms?

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

Which of the following is an example of unlike terms?

<p>$6y$ and $6y^2$ (A)</p> Signup and view all the answers

Which pair of terms are considered 'like terms'?

<p>-4ab and 7ba (D)</p> Signup and view all the answers

What is the correct algebraic expression for 'One-half of the sum of numbers x and y'?

<p>$1/2(x + y)$ (A)</p> Signup and view all the answers

Which option represents 'Numbers x and y both squared and added'?

<p>$x^2 + y^2$ (D)</p> Signup and view all the answers

Which of the following expressions represents 'Product of numbers y and z subtracted from 10'?

<p>$10 - yz$ (C)</p> Signup and view all the answers

Which of these is NOT a factor of the term –4ab?

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

Given the terms pq² and – 4pq², which statement is correct?

<p>They are like terms because the variables and their powers are the same. (D)</p> Signup and view all the answers

Which algebraic expression correctly represents 'Sum of numbers a and b subtracted from their product'?

<p>$ab - (a + b)$ (C)</p> Signup and view all the answers

Considering only the variables and their powers, which pair are NOT like terms?

<p>$9pq^2$ and $5p^2q$ (C)</p> Signup and view all the answers

A circular garden has a diameter of 21 meters. What is the length of rope needed to fence the garden twice?

<p>132 m (C)</p> Signup and view all the answers

What is the radius of a circle whose circumference is 154 meters?

<p>24.5 m (C)</p> Signup and view all the answers

A circle has a radius of 14 mm. What is its approximate area?

<p>616 sq mm (A)</p> Signup and view all the answers

If a circular sheet has a radius of 5 cm, what is its approximate area?

<p>78.5 sq cm (A)</p> Signup and view all the answers

A gardener needs to fence a circular garden with a diameter of 21 m, and the rope costs $4 per meter. What will be the total cost of the rope for two rounds of fence?

<p>$528 (C)</p> Signup and view all the answers

A circular sheet with a radius of 4 cm has a circle of radius 3 cm removed from it. What is the area of the remaining sheet? (Use π = 3.14)

<p>21.98 sq cm (B)</p> Signup and view all the answers

What is the area of a circle with a diameter of 49 meters?

<p>1886.5 sq m (A)</p> Signup and view all the answers

A circle has a radius of 21 cm. What is its circumference?

<p>132 cm (A)</p> Signup and view all the answers

Flashcards

Exponent

A number multiplied by itself a certain number of times. For example, 5 raised to the power of 3 (or 5 cubed) is 5 * 5 * 5 = 125.

Base

The number being multiplied in an exponent expression. For example, in 5 raised to the power of 3 (5 cubed), 5 is the base.

Power of a Number

The result of multiplying a number by itself a certain number of times. For example, 5 raised to the power of 3 (or 5 cubed) is 125. 125 is the 3rd power of 5.

Exponential Notation

Multiplying a number by itself a certain number of times is written as 'a raised to the power of n' or 'a to the power of n', where 'a' is the base and 'n' is the exponent.

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Squared

A number raised to the power of 2. For example, 5 squared (5^2) is 5*5=25

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Cubed

A number raised to the power of 3. For example, 5 cubed (5^3) is 555=125.

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Expressing a number in Exponential form

Any number or variable multiplied by itself a specified number of times (the exponent) can be expressed using exponents. For example, 7 multiplied by itself 3 times can be written as 7^3.

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Comparing exponential numbers

To compare two numbers written in exponential form, calculate their values and see which is greater.

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Numerical Coefficient

A numerical factor that multiplies a variable in an algebraic expression. It's the number that sits in front of the variable.

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Like Terms

Terms with the same algebraic factors (including variables and their exponents).

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Unlike Terms

Terms with different algebraic factors. They cannot be combined directly.

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Constant

In an expression, it's the term without any variables. It simply exists as a standalone number.

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Algebraic Expression

A combination of constants, variables, and mathematical operations (+, -, ×, ÷).

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Term

In an algebraic expression, it's the part with a variable or combination of variables. It's the 'action' part of the expression.

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Finding the Coefficient

The process of determining the numerical coefficient of a specific variable in an expression.

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Equivalent Expressions

Algebraic expressions with the same terms but different numerical coefficients. They have the same variable structure.

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What is x²?

An expression obtained by multiplying a variable by itself. It is written as x raised to the power of 2, or x².

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What is x³?

An expression obtained by multiplying a variable by itself three times. It is written as x raised to the power of 3, or x³.

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What is a variable expression?

An expression formed by combining variables with constants. Example: 4x + 5, where 4 is the constant and x is the variable.

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What is a term in an expression?

A part of an algebraic expression that is separated by addition or subtraction. Example: In the expression 4x + 5, 4x and 5 are individual terms.

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What are factors in an expression?

Numbers or variables that are multiplied together to form a term. Example: In the term 4x, 4 and x are factors.

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What is a product of variables?

An expression formed by multiplying variables with other variables. Example: xy, where x and y are variables.

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How is 3x² obtained?

An expression obtained by multiplying a term by a constant. Example: 3x², where 3 is the constant and x² is the term.

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How is 3x² - 5 obtained?

An expression obtained by adding or subtracting constants to a term. Example: 3x² - 5, where 5 is the constant and 3x² is the term.

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Combining Like Terms

The process of identifying and combining like terms in an algebraic expression.

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Variable

A symbol that represents an unknown value.

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Coefficient

A number that multiplies a variable in an algebraic expression.

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Omitted coefficient of +1

When the coefficient of a term is +1, it is usually omitted. For example, 1x is written as x; 1x2y2 is written as x2y2.

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Omitted coefficient of –1

The coefficient of a term is –1 and is indicated only by the minus sign. For example, (–1)x is written as –x; (–1)x2y2 is written as –x2y2.

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Constant Term

A term that has no variables and only consists of a numerical value. It has a fixed value unaffected by the variable's value. For example, 4, 7, -5 are constants.

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Algebraic Term

A term that includes variable(s) and possibly a coefficient.

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Expression

A group of terms combined using addition or subtraction operations. For example, 8y + 3x2, 7mn – 4 are expressions.

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Identifying Terms in an Expression

The process of identifying all of the terms within an algebraic expression. For example, in 8y + 3x2, the terms would be 8y and 3x2.

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Circumference

The distance around a circle.

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Radius

The line segment that connects the center of a circle to a point on the circle.

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Diameter

The line segment that passes through the center of a circle and has its endpoints on the circle.

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Area of a circle

The region enclosed by a circle.

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Area of a circle formula

The formula to calculate the area of a circle: Area = πr² where π (pi) is a constant approximately equal to 3.14 and r is the radius.

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Circumference formula

The formula to calculate the circumference of a circle: Circumference = 2πr where π (pi) is a constant approximately equal to 3.14 and r is the radius.

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Area between two concentric circles

The space between two concentric circles.

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Concentric circles

Circles with the same center.

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Study Notes

Exponents and Powers

  • Large numbers can be written in a shorter form using exponents.
  • 10,000 = 10 × 10 × 10 × 10 = 104
  • '10' is the base, '4' is the exponent.
  • 104 is read as 'ten raised to the power of four' or 'ten to the power four' or 'fourth power of 10'
  • 1000 = 10 × 10 × 10 = 103
  • 100,000 = 10 × 10 × 10 × 10 × 10 = 105
  • In exponential form, the base is the number being multiplied and the exponent is how many times the base is multiplied.

Expanding Numbers

  • 47561 = (4 × 10,000) + (7 × 1000) + (5 × 100) + (6 × 10) + 1
  • 47561 = (4 × 104) + (7 × 103) + (5 × 102) + (6 × 101) + (1 × 100)

Laws of Exponents

  • am × an = a(m + n)
  • am ÷ an = a(m – n)
  • (am)n = a(m × n)
  • am × bm = (ab)m
  • a0 = 1 (any non-zero integer a)

Taking Power of a Power

  • (am)n = a(m × n)
  • (23)2 = 2(3 × 2) = 26 = 64

Dividing Powers with the Same Base

  • am ÷ an = a(m – n)
  • 37 ÷ 34 = 3(7 – 4) = 33 = 27

Taking Power of a Power

  • (am)n = a(m × n)

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