Amodel of a volcano has a height of 12 in., and a diameter of 12 in. what is the approximate volume of the model?

Cone Volume = (PI * radius^2 * height) / 3

Cone Volume = (PI * 6^2 * 12) / 3

Cone Volume = 452.3893421169 cubic inches

Source: http://www.1728.org/volcone.htm

Step-by-step explanation:

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

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