9 Find the sum of (x + 5), (-4x – 2), and (2x – 1).

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Step-by-step explanation:

(x+5) is x+5

(-4x-2) is -4x-2

(2x-1) is 2x-1

-x + 2

Step-by-step explanation:

So I assume that the question would be set up like this if you are finding the sum of all 3 terms:

(x + 5) + (-4x - 2) + (2x - 1)

1) Take out parentheses

x + 5 - 4x - 2 + 2x - 1

2) Add like terms

For the x terms:

x - 4x = -3x

-3x + 2x = -x

For the other terms:

5 - 2 = 3

3 - 1 = 2

The sum of the terms is -x + 2

add an image

step-by-step explanation:

answer: ratio of volume of cone (with 3 times the height and equal diameter) to volume of cylinder is 2 to 1. the value of π is not used.

step-by-step explanation:

radius is diameter/2 = 4.

area of circle is π r^2.

volume of cylinder is height × area of base = hπr^2 = 3(4^2) π = 48π cubic inches.

not knowing the formula for volume of cone, i calculate it using calculus (which is for calculating things).

volume of cone is integral 0 to h area(y) dy. area(y) is π r(y)^2. r(y) runs r to zero as y runs zero to h, r(0) = r, r(h) = 0.

r(y) = r - r/h y

area(y) = π (r - r/h y)^2 = π (r^2 - 2r^2y/h + r^2y^2/h^2) = π r^2(1-2y/h+y^2/h^2)

antiderivative area(y) = π r^2 (y-y^2/h+y^3/(3h^2))

integral 0 to h = π r^2(h-h^2/h+h^3/(3h^2) - (0)) = π r^2(h - h + h/3) = π r^2(h/3) = π/3 r^2 h

volume of this cone is π/3(4^2)18 cubic inches.

= 6 16 π = 96π cubic inches.

cone has twice the volume, 96/48.

cone height is 6 times the cylinder.

ratio of volume formula: π r^2 cancels.

cone over cylinder ratio is 6h/3 to h, 2 to 1.