The sum of two numbers is 28 and their difference is 4 what are the numbers?

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

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!