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3 years ago

A lighthouse casts a 128-ft shadow. A nearby lamppost that measures 5

Mathematics

1 answer:

olga nikolaevna [1]3 years ago

8 0

Answer: 80 feet

Step-by-step explanation:

We can write these as fractions and do cross multiplication with the numerator being the height of the object while the denominator being the length of the shadow:

5 * 128 = 8x

640 = 8x

80 = x

Thus, the height of the lighthouse is 80 feet tall.

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Complete Question

A biologist reports a confidence interval of (3.5,4.9) when estimating the mean height (in centimeters) of a sample of seedlings. What is the estimated margin of error and the sample mean?

Answer:

The margin of error is $E = 0.7$

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Step-by-step explanation:

from the question we are told that

The upper limit is $k = 4.9$

The lower limit is $r = 3.5$

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3 years ago

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prohojiy [21]

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Your welcome :)

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Step-by-step explanation: