Another one? Please help. Thank you so much!

Question

asked Aug 28, 2023 209k views

1 Answer

Mmccaff · Answer 1 · 2023-09-01T13:08:19+0000

Hi there!

8.

Recall the following properties:

$(1)/(x^(-a)) = x^a\\\\x^0 = 1$

Thus, we can rearrange the expression in parts.

$(3x)^0 = 1\\\\x^4 = x^4\\\\y^(-4) = (1)/(y^4)\\\\(1)/(x^(-3)) = x^3\\\\(1)/(y^(-7)) = y^7$

Now, combine these terms:

(1) * x^4 * (1)/(y^4) * x^3 * y^7 = (x^4 * x^3 * y^7)/(y^4)

More properties:

$x^a * x^b = x^(a + b)\\\\(x^a)/(x^b) = x^(a - b)$

Rewrite:

$(1) = x^(4 + 3) * y^(7 - 4) = \boxed{\text{D) } x^7y^3}$

9)

Begin by solving the inside of the parenthesis.

$(3^2 + 3^0)^2 = (9 + 1)^2 = 10^2 = 100\\\\(6^(-2) + 3)^0 = 1\\\\100 - 1 = \boxed{ \text{ B. 99}}$

10)

Simplify the inside of the parenthesis using the above properties.

((x^2y^5z^3)/(xy^7))^(-2) = ((xz^3)/(y^2))^(-2)

Since there is a negative in the outside exponent, we must take the reciprocal. (flip the numerator and denominator).

=( (y^2)/(xz^3))^2

Square both the numerator and denominator.

Recall the property:

(x^a)^b = x^(ab)

$= (y^(2*2))/(x^2 * z^(3 * 2)) = \boxed{ \text{C. }(y^4)/(x^2z^6)}$