Sam runs the 100-meter sprint in 19.6 seconds. Tim runs the same
distance in 21.4 seconds. How
much faster is Sam?

1.8 seconds

Step-by-step explanation:

I basically just subtracted 19.6 from 21.4 to get my final answer of 1.8 seconds. I hope this helps!

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.