Subtract. (−d2 + 12d − 4) − (−7d2 − 2d + 12) =

The answer would be 26d - 16

I am using d^2 instead of d2 as that seems written incorrectly.

Same for -7d^2 instead of -7d2.

Start by changing the signs in the 2nd parenthesis by changing the subtract sign to a plus.

(-d^2 + 12d - 4) + (7d^2 + 2d - 12)

Now combine like terms

(7d^2 - d^2) + (12d + 2d) + -4 + -12

6d^2 + 14d + -16 (or 6d^2 + 14d - 16)

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.

b. hannah is playing with her cousin at