What is the volume of the sphere? round to the nearest cubic unit.
diameter: 16cm

a)268cm
b)2145cm
c)17, 157cm
d)536cm

Volume of a sphere:

(4/3)(pi)r^3

.

radius (r) is half the diameter or 8 inches.

(4/3)(3.14)8^3

2144 cubic inches

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