Match the functions to the ranges when the domain is (1,2) (x)=3x + 5 f(x) = x^2 - 2x -5 f(x) =(x+5)x^2 f(x) =4-x

the expected value of the random variable : 0, 1 and 2

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18