First size: SA1 = 2B + Ph, where B = area of the base of the figure, P = perimeter of the base and h = height
SA1 = 2(12*7,2) + (12+7,2)*31 = 172.8 + 595.2 = 768 cm^2
Second size: SA2 = 2B + ph2 (where h2 is the new height, 31.9 cm)
SA2 = 2(12*7,2) + (12+7,2)*31.9 = 785.28 cm^2
It increases (by rounding it down) by 17 cm^2.
<h3><u>(f - g)(x) = -2x^2 + 10x</u></h3>
x^2 + 6x - 1 - (3x^2 - 4x - 1)
Distributive -1 to each term in parentheses.
x^2 + 6x - 1 - 3x^2 + 4x + 1
Combine like terms.
-2x^2 + 10x
<span>Jonathan’s class has 30 boys. 60% are girls
Then
30 x 60/100 =18
Answer:
There are 18 girls in Jonathan's class</span>