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stiks02 [169]
3 years ago
11

At the market, 5 light bulbs cost $9.85. How much do 7 light bulbs cost?

Mathematics
1 answer:
ser-zykov [4K]3 years ago
5 0
First, find what one lightbulb costs.

9.85 / 5 = 1.97

Then multiply the product by 7.

1.97 * 7 = 13.79

Seven light bulbs will cost $13.79
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Answer:

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For rectangular boxes, calculate the sum of each side, then multiply it by two.

Box 1: 2(18 x 5) + 2(18 x 4) + 2(5 x 4) = 364

Box 3: 2(11 x 8) + 2(8 x 3) + 2(3 x 11) = 290

Box 5 is a cube (all sides equal), so you can find 1 side's area and multiply it by 6.

Box 5: 6(8 x 8) = 384

For triangular boxes, calculate the edges, then find the triangular area using area = 0.5(base x height).

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Box 4: 2(13 x 2) + (10 x 2) + 2(0.5)(10 x 12) = 192

Total: 364 + 290 + 384 + 216 + 192 = 1446

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Area of 1 roll = 30 x 60 = 1800

Since 1446 is less than 1800, you only need 1 roll of wrapping paper.

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