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Laabri

Open Up - Grade 7 - Mathematics - Unit 4 - Lesson 3

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"Source: Open Up Resouces (Download for free at openupresources.org.)"

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1.

It takes an ant farm 3 days to consume \frac{1}{2} of an apple.

At that rate, in how many days will the ant farm consume 3 apples?

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2.

To make a shade of paint called jasper green, mix 4 quarts of green paint with \frac{2}{3} cups of black paint.

How much green paint should be mixed with 4 cups of black paint to make jasper green?

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3.

An airplane is flying from New York City to Los Angeles. The distance it travels in miles, d, is related to the time in seconds, t, by the equation d = 0.15t.

How fast is it flying? Be sure to include the units.

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4.

An airplane is flying from New York City to Los Angeles. The distance it travels in miles, d, is related to the time in seconds, t, by the equation d = 0.15t.

How far will it travel in 30 seconds?

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5.

An airplane is flying from New York City to Los Angeles. The distance it travels in miles, d, is related to the time in seconds, t, by the equation d = 0.15t.

How long will it take to go 12.75 miles?

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6.

A grocer can buy strawberries for $1.38 per pound.

Write an equation relating c, the cost, and p, the pounds of strawberries.(in c= form)

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7.

A grocer can buy strawberries for $1.38 per pound.

A strawberry order costs $241.50. How many pounds did the grocer order?

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8.

Crater Lake in Oregon is shaped like a circle with a diameter of about 5.5 miles.

How far is it around the perimeter of Crater Lake?

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9.

Crater Lake in Oregon is shaped like a circle with a diameter of about 5.5 miles.

What is the area of the surface of Crater Lake?

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10.

A 50-centimeter piece of wire in bent into a circle.

What is the area of this circle?

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11.

Suppose Quadrilaterals A and B are both squares.

Are A and B necessarily scale copies of one another?