Me with this (answer in scientific notation) if your right ill give you brainlist

(9 x 10 ^(-5)) - (3 x 10^(-16))

Your subtracting to find the difference in size

9 x 10^(-5)

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.