Solve for f(-7)

f(x)=5-x

f(-7)= ?

After two years, how much has been paid into interest?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?