A is -11
B is -11
C is 54
Hope it helps
Answer:

b. 20 seconds
Step-by-step explanation:
Let
be the distance in miles and
be the time in seconds and
be the speed in miles/sec
Formula for Distance is given as:

Given that:
Distance = 2 miles and
Time = 10 seconds
Putting the values in formula:

<em>Answer a:</em>
Putting the value of
back in the formula to find the <em>direct variation equation </em>for the relationship between time and distance:

<em>Answer b:</em>
Using the above formula and putting
:

2a+4=10
subtract 4 from 10 and you get 6, then you divide by 2 and a=3
4b-3=17 same here
you do the opposite sign so you add 3 to 17 and you get 20 then you divide by 4 and b=5
3c+5=11
subtract 5 from 11 you get 6 then you divide by 3 and c=2
Combine like terms, then divide by 7