Answered

  1. Which of the following is equivalent to x5y2/xy2 when x ≠ 0 and y ≠ 0?
Ax6y5
Bx5y
Cx4y
Dx4 ******

  1. Which expression is NOT equal to 125?
A5(5^3/2/5)^2 *********
B(5^3/5^4)^-3

C.5^-2/5^-5

D5(5^5/5^3)

  1. A fraction reduces to 36. If its denominator is 6x5, what is its numerator?
A63x
B63x5 ********
C6x5
D67x5

  1. Which is the correct simplification of 5.4 x 10^12/1.2 x 12^3 written in scientific notation?
A4.5 × 10^7
B4.5 × 10^9 *******
C45 × 10^6
D6.48 × 10^7 5.


Which of the following statements is not true regarding operations with exponents?

ATo divide powers with the same base, subtract the exponents.
BTo subtract powers with the same base, divide the exponents. *********
CTo multiply powers with the same base, add the exponents.
DTo raise a power to a power, multiply the exponents.

Verified Answer :

JcAlmighty

Q1. The answer is D. x4

Let's first rewrite the expression:
x⁵y²/xy² = x⁵/x y²/y²

Using the rule xᵃ/xᵇ = x(ᵃ⁻ᵇ), we can write the expression as following:
x⁵y²/xy² = x⁵/x y²/y² = x⁵⁻¹ y²⁻² = x⁴ y⁰ = x⁴ 1 = x⁴

Thus, the correct answer is D.


Q2. The answer is A. 5(5^3/2/5)^2

125 in the form of exponent is 5³.
125 = 5³
Now, let's calculate all choices. 
 
The rules we will use are:
xᵃ xᵇ = x(ᵃ⁺ᵇ)
xᵃ/xᵇ = x(ᵃ⁻ᵇ)
(xᵃ)ᵇ = xᵃᵇ

A. 5(5³/2/5)² = 5 (5³ 5/2)²
                      = 5 (5³⁺¹/2)²
                      = 5 (5⁴/2)²
                      = 5 (5⁴)²/(2)²
                      = 5 5⁴²/4
                      = 5 5⁸ / 4
                      = 5¹⁺⁸ / 4
                      = 5⁹/4
                      ≠ 5³ ≠ 125

B. (5³/5⁴)⁻³ = (5³⁻⁴)⁻³
                   = (5⁻¹)⁻³
                   = 5⁽⁻¹⁾⁽⁻³⁾
                   = 5³
                   = 125

C. 5⁻²/5⁻⁵  = 5⁽⁻²⁾⁻⁽⁻⁵) 
                  = 5⁽⁻²⁾⁺⁵
                  = 5³
                  = 125

D. 5(5⁵/5³) = 5 5⁵⁻³
                  = 5 5²
                  = 5¹⁺²
                  = 5³
                  = 125

Therefore, the only expression that is not equal to 125 is A.


Q3. The answer is 63x5

Let's check all choices
The rules we will use are:
xᵃ xᵇ = x(ᵃ⁺ᵇ)
xᵃ/xᵇ = x(ᵃ⁻ᵇ)
(xᵃ)ᵇ = xᵃᵇ

A. 6³x 
6³x/6x⁵ = 6³/6 x/x⁵
             = 6³⁻¹ x¹⁻⁵
             = 6²x⁻⁴
             = 36x⁻⁴
             ≠ 36

B. 6³x⁵ 
6³x⁵/6x⁵ = 6³/6 x⁵/x⁵
              = 6³⁻¹ x⁵⁻⁵
              = 6² x⁰
              = 36 1
              = 36

C. 6x⁵ 
6x⁵/6x⁵ = 1
             ≠ 36

D. 6⁷x⁵
6⁷x⁵/6x⁵ = 6⁷/6 x⁵/x⁵
              = 6⁷⁻¹ x⁵⁻⁵
              = 6⁶ x⁰
              = 46656 1
              ≠ 36

Therefore, the correct choice is B.


Q4. The answer is

We will use the rule: xᵃ/xᵇ = x(ᵃ⁻ᵇ)

5.4 x 10¹²/1.2 x 10³ = 5.4 / 1.2 x 10¹²/10³
                               = 4.5 x 10¹²⁻³
                               = 4.5 x 10⁹


Q5. The answer is B. To subtract powers with the same base, divide the exponents

Some of the rules regarding operations with exponents are:
xᵃ/xᵇ = x(ᵃ⁻ᵇ) - choice A
xᵃ xᵇ = x(ᵃ⁺ᵇ) - choice C
(xᵃ)ᵇ = xᵃᵇ - choice D

Through the process of elimination, choice B is not true.

Related Questions