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April 19, 2014

Homework Help: algebra, HELP!

Posted by Lilly on Monday, November 12, 2012 at 12:33pm.

9.
The sides of a rectangle are increased by a scale factor of 4. The perimeter of the smaller rectangle is 20 cm. What is the perimeter of the larger rectangle? (1 point)

320 cm
80 cm
120 cm
60 cm

10.
A right triangle has an area of 13 m2. The dimensions of the triangle are increased by a scale factor of 3. What is the area of the new triangle? (1 point)

39 m2
169 m2
117 m2
142 m2
12.
The width of a picture is 20 cm. Using a color copier, you reduce the width of the picture to 5 cm. What is the scale factor of the dilation? (1 point)

5
1 over 5
4
1 over 4

13.
On a given blueprint, 1 inch = 16 feet. If the dimensions of the bedroom on the blueprint are 0.75 inches 1.5 inches, what are its actual measurements? (1 point)

16 ft 32 ft
12 ft 24 ft
16 ft 24 ft
12 ft 32 ft

14.
Using the same scale factor, what are the blueprint dimensions for a room that is 20 feet x 28 feet? (1 point)

1.5 in. 2.5 in.
1.25 in. 2.25 in.
1.25 in. 1.75 in.
1.5 in. 1.75 in.

15.
The scale of a map is 1 in.:75 mi. How many actual miles does 0.85 inches represent? (1 point)

88.2 miles
63.75 miles
95.6 miles
4,781.3 miles

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