A family is driving 550 miles to their grandmother's house. They have already driven 350 miles. Which equation shows the rate r, in miles per hour the family must drive to reach their grandmother's house in 4 hours

50 mph

Step-by-step explanation:

drive to reach their grandmother's house in 4 hours

Given that:

Miles driven = 550 miles

Miles already driven = 350 miles

Miles left to drive = (550 - 350) miles = 200 miles

To reach destination in 4 hours

Speed in miles per hour will be :

Distance / time

= 200 miles / 4 hours

= 50 miles / hour

a 10 percent increase

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square