Help. please. now. lol.

The answer is going to be 15 nights

Since it gave us the duration of study by Nisha for the spelling bee=5 hours

We need to rate of her study which is=1/3 hour per night

Let she studies y hours for the spelling bee

Then we need to rate of her study=5/y which will divide hours of study by y

5/y=1/3
y=5(3)
y=15hours

Therefore she will have to study 15 nights.

If this helps, please mark me as brainiest, thanks!!

C

Explanation:

Operating leverage may be defined as the potential use of fixed operating costs to magnify the effects of changes in sales on a firm's earnings before interest and taxes