What is two divided by 5 multiplied by one divided by three

If square root x = -7, then x= -49 true or false

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?

Find the maximum value of p= 4x + 5y subject to the following constraints :