If for all real x we assume f(g(x)) = x and f'(x)= 1 + [f(x)]^2 then g'(0) is equal to?

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?

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?