Question

Pls help. do all three for brainliest!​

Answer 1

Answer:

Rectangular pyramid volume: 8×9×9/3 = 216 cm³

Rectangular prism volume: 8×9×7 = 504 cm³

Total volume of composite figure: 216+504 = 720 cm³

Answer 2

Answer:

720 cm³

Step-by-step explanation:

Rectangular pyramid:

Volume = $\frac{1}{3}BH$

H = 9 cm

B-> base area =  area of rectangle

B = length * width = 8*9 = 72  square cm

$Volume = \frac{1}{3}*72*9 = 216 \ cm^{3}$

Rectangular prism:

length = l = 8 cm

Width = w = 9 cm

Height = h = 7 cm

Volume of rectangular prism = l * w * h = 8 * 9 * 7 = 504 cm³

Volume of composite figure = volume of pyramid + volume of r. prism

      = 216 + 504

      = 720 cm³