Select the best answer for the question, 18. Which one of the following statements expresses a true proportion?
O A. 3:4 = 9:12
O B. 7:9 = 8:9
O C. 54:9 = 6:3
O D.21 = 12
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d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000

the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

step-by-step explanation: