19,749,600 is the correct answer. according to calculator
For the first one its a slope of -2/3
The second one is 4/5
and the third one is -1/7
Your answer is right
3x^2 + 13x + 4
We can see that for every 1 hour he increases 10 miles in his distance, so we can say it's constant, he started at 0 and increased 10 miles per hour.
Alternative C.
