2x - y2
Z-5
Evaluate when x = 2, y = 4
z=3

Putting the value in x = 2 , y =4 in 2x - 2y we get,

2 × 2 - 4× 2= 4-8 = -4

Putting the value in z = 3 in z - 5 we get,

z - 5 = 3 - 5 = -2

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844