Simplify the expression

3(a + 6)+ 4a

6x + 4y + 6x

9(5x)

What is the base of 1/9 to the power of 2

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?

Jim had 15 minutes to do 5 laps around his school what would his time be