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evablogger [386]
3 years ago
9

The formula for the volume of a cone is V=1/3bh Solve V=1/3bh for b, the base of the cone.

Mathematics
1 answer:
Stels [109]3 years ago
4 0

Answer:

b = 3Vh

Step-by-step explanation:

When they ask to solve for b, you are essentially rearranging the equation so that b is alone on one side.

V = 1/3bh

(V)(3) = (1/3bh)(3)

3V = bh

(3V)/h = (bh)/h

3Vh = b

b = 3Vh

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(x/x+3)-(8/x+2)=(-13x-6)/(x^2+5x+6)​
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Answer:

x = -9

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Step-by-step explanation:

Given:

\dfrac{x}{x+3}-\dfrac{8}{x+2}=\dfrac{-13x-6}{x^2+5x+6}

First, note that

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Since x+2 and x+3 stay in the denominator, then

x\neq -2\ \text{and}\ x\neq -3

Now add two fractions which stay in the left part. The common denominator is (x+2)(x+3), so multiply the numerator of the first fraction by (x+2) and the numerator of the second fraction by (x+3) and subtract them in the numerator:

\dfrac{x}{x+3}-\dfrac{8}{x+2}=\dfrac{-13x-6}{(x+2)(x+3)}\\ \\\dfrac{x(x+2)-8(x+3)}{(x+2)(x+3)}=\dfrac{-13x-6}{(x+2)(x+3)}\\ \\x(x+2)-8(x+3)=-13x-6\\ \\x^2+2x-8x-24=-13x-6\\ \\x^2+2x-8x+13x-24+6=0\\ \\x^2+7x-18=0\\ \\x^2+9x-2x-18=0\\ \\x(x+9)-2(x+9)=0\\ \\(x+9)(x-2)=0\\ \\x+9=0\ \text{or}\ x-2=0\\ \\x=-9\ \text{or}\ x=2

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