40 or 20 points-
I need help!

List from greatest to least - 19:  35/40, 17/20, 4/5, 7/10

List from least to greatest - 20: 7/10, 4/5, 17/20, 35/40

21 aka -7(-4): -3

22 aka -20 + (-10): 30

23 aka 48 + -6: 42

24 aka 15+(-8): 23

Hope this helps! :)

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.