The radius of the base of a cylinder is 38 mm and its height is 51 mm. Find the surface area of the cylinder in terms of r. A. 67265 mm B.6853x mmC. 67643 mm D. 67135 mm

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step-by-step explanation:

not sure but it may be b, as i said i'm not sure.

beluga wheeeaaalle matt

step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb