For every three days Rob hikes, he uses one half of a roll of film in his camera. He is planning a 24-day hike and wants to be able to take pictures each day.

How many rolls of film should Rob pack?

Rob needs 4 rolls of film

Step-by-step explanation:

We need a relationship between the number of rolls of film and days hiking.

let  

R = number of rolls

D = days hiking.

R =   rate * D

rate = R/ D =  (1/2) / 3 =  1/6

R = (1/6) * D

R = (1/6) * 24 = 4 rolls of film

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step-by-step explanation:

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!