Answer:
9 x 2 + 7x
18 + 7x - 6
18 - 6 = 12
12 + 7x
Is your simplified expression
81 square inches
9*9*9=729
729/9(height of cube)=81(length and width of cube=area of cube)
The base of a cone is something circular, like a circle or an ellipse.
The rest of the options (square, triangle, and pentagon) are all based of pyramids, not cones. Cones have to have a circular base because otherwise they'd be pyramids.
Sum means add
(x+5) + (-4x-2) + (2x-1)
=-3x+3+(2x-1)
=-x+2
289 square root = 17
17*17=289
Say 17 was length and 17 was width. L*w=289
Also, all sides of the square are the same.
