1.Calculate the Interest Rate Interest: $38.88
Principal: $72
Time: 3 years
a. 18
b. 19.2%
c. 24%
d. 26.1%

a. 18%

Step-by-step explanation:

Interest: $38.88

Principal: $72

Time: 3 years

Interest rate = x

Correct choice is a. 18%

if x decreases by 4 then y increases by 10

step-by-step explanation:

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.