Having trouble with these types of problems,

Probability distribution - if any of the values result in 0, make sure to explain why or points will not be earned

a. A continuous probability function is equal to 1/9 and the function is restricted to 0 x < 9. What is the P (x > 3)?

b. Still for the function 1/9 and the function is restricted to 0 x < 9, what is the probability that x falls between 2 and 7?

c. Still for the function 1/9 and the function is restricted to 0 x < 9. What is the P (x > 9)?

d. A continuous probability function is equal to 1/8 and the function is restricted to 0 x < 8. What is P(x < 0)?

e. A continuous probability function is equal to 1/7 and the function is restricted to 0 x < 7. What is P(x = 8)?