Answer:
a 7/20. B 13/20
Step-by-step explanation:
800 X 35% = 280
280/800=7/20
a. 280/800 (or 7/20 simplified)
b. 520/800 (or 13/20 simplified)
a. 800 × 0.35 = 280
Fraction of girls = total girls/total enrollment = 280/800 (or 7/20 simplified)
b. Total boys = Total enrollment - total girls = 800 - 280 = 520
Fraction of boys = total boys/total enrollment = 520/800 (or 13/20 simplified)
Equation
A = (b1 + b2)*h /2
Givens
b1 = 5 feet
b2 = 7 feet
h = 3 feet
Sub and solve
Area = (5 + 7)*3/2
Area = 12*3/2
Area = 36/2
Area = 18 Square feet.
https://www.mesacc.edu/~scotz47781/mat120/notes/quad_formula/quad_formula.html
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