3 years ago

five times the difference of twice a number and three, decreased by the sum of the number and eight, equals thirteen

1 answer:

7 0

5x(2y-3)-(y+8)=13 I believe this is correct

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marusya05 [52]

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Answer:

$A=4\pi r(l+r)$

Step-by-step explanation:

The total surface area of a cone is given by :

$A=\pi rl+\pi r^2\\\\=\pi r(l+r)$

Put r = 2r and l = 2l in the above formula

$A=\pi \times 2r(2l+2r)\\\\A=2\pi r(2l+2r)\\\\=2\pi r \times 2(l+r)\\\\=4\pi r(l+r)$

Hence, the total surface area of the cone is $4\pi r(l+r)$ .

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