2 years ago

A frustum is formed when a plane parallel to a cone’s base cuts off the upper portion as shown.

2 answers:

4 0

The volume of a cone is
V = (1/3) π r² h
where r = radius of the base
h = the height.

The volume of the frustum is
(1/3)π(7.5²)(11+8) - (1/3)π(3.5²)(8)
=(1/3)π(7.5²)(19) - (1/3)π(3.5²)(8)

The 3rd choice is the correct answer.

Answer:
$\frac{1}{ 3} \pi (7.5^{2})(19) - \frac{1}{3} \pi (3.5^{2})(8)$

inn [45]2 years ago

3 0

Option c (choice 3) is the correct choice

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Jack is mowing a lawn that has a shed. needs to know area of lawn to mow. dimensions of yard are 5x by 13 x-4 . she'd are 2x by

Elena-2011 [213]

The diagram of the lawn and the shed is shown below.

The area of the lawn needed to be mowed equals to the area of the yard minus the area of the shed

The area of the yard = $(5x)(13x-4) = 65 x^{2} -20x$
The area of the shed = $(2x)(2x+4)=4 x^{2} +8x$

The area of the lawn = $65 x^{2} -20x-(4 x^{2} +8x)$
The area of the lawn = $65 x^{2} -20x-4 x^{2} -8x$
The area of the lawn = $61 x^{2} -28x$