Why can you subtract an even number from another even number?

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

if you was gonna solve for a, a is a   < -12

4+4+2x

or

2x+8

step-by-step explanation:

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours