Question

Evaluate the expression 4x^9y^-4/x^8y^-6 for x = 5 and y = 2.

Answer 1

9.6 hope this helps you
if not my bad.

Answer 2

Answer: 
80

Explanation: 
$\frac{4x^{9} y^{-4}}{ x^{8} y^{-6} }$ 
x = 5 and y = 2 
$\frac{4(5)^{9} (2)^{-4}}{ (5)^{8} (2)^{-6} }$ 
Solve all the exponents first: 
$\frac{4(1953125)(.0625)}{(390625)(.015625)}$
Multiply.
$\frac{488281.25}{6103.5156}$ 
Divide.
80