Answer:
#7. 36 ft, #8. D, #9. B, #10. B
Explanation:
For #7, they are similar triangles, and the bigger triangle is 18/3 times bigger, which is 6. 6*6 = 36. The height of the building is 36 feet. For #8, the answer is D because the circle is dilated with a ratio of 8/3. For #9, the answer is B because the multiplication by 0.4 is a dilation with a scale factor of 0.4. For #10, the two triangles are similar. The bigger triangle is bigger by a scale factor of (24+6)/6, which is 5. This means the perimeter is 5 times bigger than the smaller triangles perimeter, which is 20 units. 20 times 5 is 100, which is the bigger triangle's perimeter. The answer is B.