Answer:
114.3cm^3
Step-by-step explanation:
Square Pyramid Formulas derived in terms of side length a and height h: Volume of a square pyramid
V = (1/3)(Base area of a square)(Height of the square pyramid).
V = (1/3)areahight
Area of the square
A = 7 x 7
A = 49
V = (1/3)49 x 7
V = (1/3)343
V = 114.(a repeating term)3
since we rounded
V = 114.3cm^3
90
X=15
A +B + C = 180
2x +4x+ 6x = 180
12x =180
X= 15
$14.4
20%= .2
$18 x .2 = $3.60
$18 - $3.6 = $14.4