Find the surface area of the ball. leave the answer in terms of pi d = 68 mm a. 4,624pi mm2 b. 5,321pi mm2 c. 4,872pi mm2 d. 5,121pi mm2

the answer is  

a.

4,624π mm2

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

step-by-step explanation: