Please help!! much appreciated

A. 11 and -3

Step-by-step explanation:

≈ 7

4 + 7 = 11

4 - 7 = -3

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.