Answer:

d. 4c + 11d + 15

Step-by-step explanation:

This is a pretty simple combining like terms problem.

10c - 6c = 4c

3 + 12 = 15

7d + 4d = 11d

Therefore, our expression will be 4c + 11d + 15.

<u>Combine like terms:</u>

4.3 meters per second

55.9 meters ÷ 13 seconds

We want a unit rate where

1 is in the denominator,

so we divide top and bottom by 13