First let's make both the miles and the hours ran improper fractions:

So, to find our miles per hour, we have to divide the miles by the hours to get: 
Answer:
Step-by-step explanation:
f(x) = -8x + 20
f(-1) = -8* -1 + 20 = 8+20 =28
5 - 2[f(-1)] = 5 - 2*28 = 5 - 56 = -51
-25 and -24
You can find this using the equation below:
x + (x + 1) = -49
Solve for x
A=x+y+z/3
a-x=y+z/3
a-x-z/3=y
so y=a-x-z/3