5. The surface area of a cylinder varies jointly as the radius and the sum of the radius and the height. A cylinder with a height of 8 cm and a radius of 4 cm has a surface area of 961. What is the surface area of a cylinder with a radius of 3 cm and a height of 10 cm?
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CYLINDER
I don't understand it but, Hope it helps!
It is given that the area A of a cylinder varies jointly as the radius r and the sum of the radius and height
and 
when 
and 
, therefore
Thus, the general equation is
Since
and 
, therefore,
Hence, the surface area of the cylinder with radius
and height 
is 
.
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