Rewrite each sum as a product of the gcf and a new sum 12 +18+21

3(4+6+7)

Explain: greatest common factor of the 3 numbers is 3. After you get 3 out of the 3 numbers, you will end up with 3(4+6+7)

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

10.416 meters per second

step-by-step explanation:

distance=1 00 meters

time= 9.6 seconds in decimal form or 9 3/5 as a mixed number

average speed= 100/9.6

=10.416 meters per second or 10 52/125 as a mixed number.