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adoni [48]
3 years ago
8

How do I figure this out?

Mathematics
1 answer:
blsea [12.9K]3 years ago
7 0
Answer: 20.5

Form your equation. The formula for perimeter is (2l)(2w) or l + l + w + w, where l = length and w = width.
(l - 5) + (l - 5) + (l) + (l) = 72

Simplify and solve your equation.
4l - 10 = 72
4l = 82
l = 20.5

Since l = length, length = 20.5 and width = 15.5

You can check your work, too:
20.5 + 20.5 + 15.5 + 15.5 = 72


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Answer: Choice B

2 = \log_{8}(64)

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Explanation:

The original equation is 8^2 = 64 with 8 as the base. That is also the base of the log when we get the final answer shown above. Logs are useful to isolate the exponent.

The general rule is that \text{y} = b^{\text{x}} is equivalent to the log form of \text{x} = \log_{b}(\text{y}) where b is the base of each.

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