Question

PLZ HELP ME what is the value of y^-5 / x^-3 for x=2 and y =-4 a)-1/128 b)10/3 c) -128 d) 128

Answer 1

1st, substitute x and y with 2 and -4, which'd be $\frac{-4^{-5}}{2^{-3}}$.
Then, simplify, to get $-\frac{1}{128}$.
This would be -0.0078125 in decimal form, or - 1/128 in fraction form.

Hope this helps! ^^

Answer 2

Write in exponential form,
$- ( {2}^{2} ) ^{ - 5} \div {2}^{ - 3}$
Simplify the expression,
${ - 2}^{10} \div {2}^{ - 3}$
Calculate the quotient,
${ - 2}^{ - 7}$
Express with a positive exponent,
$- \frac{1}{ {2}^{7} }$
Evaluate the power,
-1/128
Or - 0.0078125
Your answer is A.