I need help with the functions

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I need help with the functions

1. Find the most general antiderivative of the function. (Check your answer by differentiation. Use C for the constant of the antiderivative.)

f(x) = 6x9 − 4x6 + 12x3

2.Find the most general antiderivative of the function. (Check your answer by differentiation. Use 
C for the constant of the antiderivative.)

f(x) = (x + 5)(2x − 7)

3.A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 22 ft/s
2. What is the distance covered before the car comes to a stop? (Round your answer to one decimal place.)