A curve has equation y=2/x square root what is dy/dx

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(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?

What is the the greatest common factor ?