7r-15/s when r= 3 and s = 5.

21-3=18

Hope This Helps!!!

18

Step-by-step explanation:

7(3)= 21

15/5=3

21-3=18

160

step-by-step explanation:

idk

i hope i

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.