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.
A number decreased by seven
Answer:
2a + 7b + 4
Step-by-step explanation:
4a + 8 - 2a - 4 + 7b
<u><em>Group like terms</em></u>
4a - 2a + 7b + 8 - 4
<u><em>Add similar elements (4a - 2a)</em></u>
2a + 7b + 8 - 4
<u><em>Add/Subtract (8 - 4)</em></u>
2a + 7b + 4
I hope this helps you
5+7.(2b-2b)
5+7.0
5+0
5