PLEASE HELP ASAP

Find the arithmetic mean a_n of the given terms.
a_(n-1)=9, a_(n+1)=-3

Given two terms of the arithmetic sequence, a_9 = 35 and a_14 = -15, find a_1 and d.

Big boi and travis scott are performing at the super bowl. travis scott is 62 years younger than twice big boi’s age. the sum of their ages is 70 years old. use b to represent big boi’s age. write and solve an equation.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

Which expression is equivalent to -12(3x-3/4)