For the first one just use the formula and for the second try breaking it into two rectangular prisms find the area of each of them and add them together.

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- October 7th 2007, 05:07 PM #1

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- October 7th 2007, 05:32 PM #2

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- October 7th 2007, 05:37 PM #3

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- October 7th 2007, 05:42 PM #4

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- October 7th 2007, 05:52 PM #5

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- October 7th 2007, 07:22 PM #8

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- October 7th 2007, 07:23 PM #9

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- October 7th 2007, 08:22 PM #10

- October 7th 2007, 08:22 PM #11

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- October 7th 2007, 08:23 PM #12
the length of the big block above the small block is 4 cm, the small block is 3 cm high. so the height of the big block is 3 + 4 = 7cm high

what question is that for? anyway, it doesn't matter, that is almost certainly wrong. i don't think any of the problems should be worked out like that. in your formula you have 3 things being multiplied, yet you have 6 multiplication signs, that should tell you that you're doing something wrong

- October 7th 2007, 08:30 PM #13

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- October 7th 2007, 08:56 PM #14

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- October 7th 2007, 09:01 PM #15