Simply 5^3/5^7 leaving your answer in index

Given

Step-by-step explanation:

When the base is same but the exponents are different, the rule is that a^m/a^n

= a^m-n

So in this case let a be 5, m be 3 and n be 7

5^3/5^7

= 5^3-7

= 5^-4

76%

step-by-step explanation:

24% are dogs and the remaining is 76% because 100-24=76

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.