If the height of the cone, h, is 10 millimeters and the diameter of the base, d, is 30 millimeters, what is the volume of the cone?

a. 750 π mm3

b. 500 π mm3

c. 2,250 π mm3

d. 250 π mm3

my answer is$ 12

step-by-step explanation:

because 15 -2=12

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