Can You help me please? What is the mean of the data set?

{21, 23, 25, 25, 26, 28, 28, 28, 31, 33}

A)26.8

B)27

C)27.8

D)28

Which of the following represents the zeros of f(x) = 6x3 − 31x2 + 4x + 5? −5, one third , one half 5, − one third , one half 5, one third , − one half 5, one third , one half

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?

A. what does the point (4, 122) represent? b. what is the unit rate? c. what is the cost of buying 10 tickets?