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ale4655 [162]
3 years ago
5

Isaac's rectangle measures 4 1/2 units by 2 1/4. What is it's area?

Mathematics
1 answer:
tensa zangetsu [6.8K]3 years ago
3 0
<h3>Answer:</h3>

\sf\:Area  \: of  \: rectangle = l × b

\sf\:4 \frac{1}{2}  \times 2\frac{1}{4}

\sf\frac{9}{2}  \times  \frac{9}{4}

\large\boxed{\sf\frac{81}{8}sq.\:units.}

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What's the area of this triangle
Luda [366]

Answer:

D      A = (1/2) (y₂ - y₁)(x₃ - x₁)

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3 years ago
How many business students must be randomly selected to estimate the mean monthly earnings of business students at one college?
marysya [2.9K]

Answer:

Approximately 63 business students must be randomly selected to estimate the mean monthly earnings of business students at one college

Step-by-step explanation:

confidence interval = 95%

Standard deviation (\sigma )  = 569

\alpha = 1 - 0.95 = .05

Z_{\frac{\alpha }{2}}  = Z_{\frac{.05 }{2}}  = 1.96

We want 95% confidence that the sample mean is within $140 of the population mean

margin of error ( E ) =140

let n be the sample size

margin of error ( E ) = Z_{\frac{\alpha }{2}}\frac{\sigma }{\sqrt{n}}

      squarring both side

E^{2} = 1.96^{2}\times\frac{\sigma ^{2}}{n}

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8 0
4 years ago
Please tell me what this is (correct answer)
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3 years ago
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