Answer:
the unit rate is 70 miles per 1 hour
Step-by-step explanation:
I’m not quite sure but I think it could be c. 768
Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :
7*x-4-(21)=0
Solve : 7x-25 = 0
Add 25 to both sides of the equation :
7x = 25
Divide both sides of the equation by 7:
x = 25/7 = 3.571