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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 6 Page 22

Use the formula for the volume of a prism.

31.5 cm^3

Practice makes perfect

The given solid is a prism.

The volume of a prism can be calculated using the following formula. V=Bh In the formula above h is the height, and B is the area of the base. Note that the base is a rectangle, so we can calculate its area using the formula for area of a rectangle.

B=l w

l= 4.5, w= 3.5

B=( 4.5)( 3.5)

Multiply

B=15.75

The area of the base is 15.75cm^2. We are also given that the height equals 2cm. Let's substitute these values into the formula and solve for V.

V=Bh

B= 15.75, h= 2

V=( 15.75)( 2)

Multiply

V=31.5

The volume of the prism is 31.5cm^3.

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