Question 20
Total Surface Area = (4 x 8) + (5 x 8) + (8 x 3) + 2(1/2 x 4 x 3)
Total Surface Area = 108 cm²
Question 21
Total Surface Area = 2 (π x 4²) + (π x (4x2) x 20 )
Total Surface Area = 603 cm² (Nearest whole number)
Question 22
Total Surface Area = (20 x 5) + (12 x 20) + (20 x 13) + 2 ( 1/2 x 12 x 5)
Total Surface Area = 660 In²
Your answer is 157, i'm pretty sure
Answer:
I say 36 girls, i divided 3 by 5 and multiplied it by 60, so subtract 36 by 60, so there should be 24 boys
