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bonufazy [111]
3 years ago
11

the radius of a cylindrical gift box is ​(2x+3​) inches. The height of the gift box is twice the radius. What is the surface are

a of the​ cylinder?
Mathematics
1 answer:
Serjik [45]3 years ago
3 0
Since the surface area formula is 2πrh+2πr², we can plug 2x+3 in for r and 2*(2x+3)=4x+6 in for h to get 2π(2x+3)(2)(2x+3)+2π(2x+3)²=4π(2x+3)²+2π(2x+3)²=2π(2x+3)²(2+1)=6π(2x+3)²
=6π(4x²+12x+9)
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