The average weight is 114 pounds of all 5 children.
3 * 120 = 360
2 * 105 = 210
210 + 360 = 570
570 / 5 = 114
G(f(12))
f(12) = 9 - 12 = -3
g(-3) = (-3)^2 + 4 = 9 + 4 = 13
Answer: ≈ 551.71 ft²
All work is shown in the picture.
PEMDAS:
Parenthesis Exponents Multiplication/Division Addition/Subtraction
4/3 * (2)^3
4/3 * 8
10(2/3) or 10.7 (rounded up)