A scuba diver is descending at a rate of 15 3/4 feet per minute. What is the diver’s change in altitude after 4 minutes?

A. 60 ft
B. -60 ft.
C. 63 ft.
D. -63 ft.

Question

A scuba diver is descending at a rate of 15 3/4  feet per minute. What is the diver’s change in altitude after 4 minutes?

A. 60 ft
B. -60 ft.
C. 63 ft.
D. -63 ft.

anonymous · Answer

You need to multiply 15 3/4 feet per minute by 4 minutes to find the answer.

anonymous · Answer

You can do multiplying mixed fractions a couple of ways:

1)   convert 15 3/4  to an improper fraction like:  15 = 60/4, so 15 3/4 = 63/4
Then multiply 63/4 times 4 minutes

2)  multiply 4 x 15   and add  4 x (3/4)

anonymous · Answer

Alright, the 4 x 15 isn't difficult. That's 60. The easiest way for me to get 3/4 of anything, is to put it in decimal form, and multiply your number by that. 3/4 can be expressed in decimal form as .75, so if you can't see what 3/4 of 4 is in your head, then just multiply 4 by .75 in a calculator. Then add it to 60, and there's your answer. (: