3 years ago

Yoooooo help meeeeeeee

2 answers:

5 0

The formula for surface area of a cone is πr^2 + πrl.

substitute the values and solve.
S = π(3^2) + π(3)(8)
S = 9π + 24π
S = 33π sq ft -or- ~103.67 sq ft

Ne4ueva [31]3 years ago

4 0

Answer:

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In each of the following ,make y the subject and hence find the value of y when a=2, b=3 ,and c=4.

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Part i

$\dfrac{2a-7}{6y} = \dfrac{3b-5}{2c}$

$y = \dfrac{ 2c(2a-7)}{6(3b-5)} = \dfrac{c(2a-7)}{9b-15}$

Substituting,

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Part ii

I'm not sure that one's typed in correctly but I'll solve it as written.

$3-34y + 2a = \dfrac{3b-5}{2c + 1}$

$34y = 3+2a-\dfrac{3b-5}{2c + 1}$

$y = \frac 1 {34}\left(3+2a-\dfrac{3b-5}{2c + 1} \right)$

We're not asked to simplify it so I wont. Substituting,

$y = \frac 1 {34}\left(3+2(2)-\dfrac{3(3)-5}{2(4) + 1} \right) = \frac 1 {34}(7-4/9) = \dfrac{59}{306}$

Answer: 59/306

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