The surface area of the composite shape is 1560 square inches
<u>Step-by-step explanation:</u>
The surface area of the top cardboard is,
SA = 5 x area of each side
Because one side is attached with another cardboard box . So while finding the area only 5 sides are calculated.
SA = 5 ( 10 x 10)
= 500 square inches
The surface area of the rectangular prism cardboard,
Given that,
l = 20 in
w =15 in
h = 8 in
A = 2(lw + wh + hl) - 100
We are subtracting 100 because it is the area of one side of the square cardboard box on top of the rectangular prism box .
A = 2(300 + 120 + 160) - 100
= 2(580) - 100
= 1160-100
= 1060 square inches
Total surface area = SA + A
= 500 + 1060
= 1560 square inches
Since you are looking at the hundreds place, the 9 is in the hundreds place and the number behind it is 8, since this number is greater than 5, the number 9 rounds up so the answer would be 9000.
Answer:
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Use the integer rule if the negative sign in bigger than the positive minus but the answers sign should be negative, if they switch sides it doesn’t matter you need to see what value it is and, if you want to minus with a negative you have to plus them and then add the negative sign, if you get something like this (-2- -10) you have to change it to (-2 + 10), it’s a math rule to negatives to gather represents addition.