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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

3. Solving Equations with Variables on Both Sides

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Exercise 7 Page 22

Use the formula for the volume of a pyramid.

24 in.^3

Practice makes perfect

The given solid is a pyramid.

The volume of a pyramid can be calculated using a known formula. V=1/3Bh In the formula above B is the area of the base, and h is the height. We are given that the area of the base is 18 square inches and the height is 4 inches. Let's substitute these values into the formula and calculate V.

V=1/3Bh

B= 18, h= 4

V=1/3( 18)( 4)

▼

Simplify right-hand side

Multiply

V=1/3(72)

MoveRightFacToNumOne

1/b* a = a/b

V=72/3

Calculate quotient

V=24

The volume of the pyramid is 24 cubic inches.

Subchapter links

Try It p.18-20

Self-Assessment for Concepts & Skills p.20

Self-Assessment for Problem Solving p.21

Review & Refresh p.22

Concepts, Skills, & Problem Solving p.22-24