How do i solve this equation? 6 - 0.25f = f - 3

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Find the area of the triangle shown 3 by 6

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. what distance from city a is the point where the truck and the car will meet?