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djyliett [7]
3 years ago
14

Help on these plzzzzz it is really hard

Mathematics
1 answer:
velikii [3]3 years ago
7 0
11.

Lateral area of a cube is 4*[(2.5)^2] = 4*6.25 = 25 cm^2;                    B

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13 inches = __ ft<br> PLS HELP PLS
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1.083

Step-by-step explanation:

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egoroff_w [7]

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Step-by-step explanation:

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What is the answer to 3x –7 = -16
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The annual water usage in rockport increases at a rate of 10% every year as the town gets bigger. this year, the town used 6,740
Finger [1]

Answer:

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Step-by-step explanation:

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6 0
2 years ago
An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 280 engines
DENIUS [597]

Answer:

The value of the test statistic is t = -2.09

Step-by-step explanation:

The null hypothesis is:

H_{0} = 6.6

The alternate hypotesis is:

H_{1} \neq 6.6

Our test statistic is:

t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation(square roof of the variance) and n is the size of the sample.

In this problem, we have that:

X = 6.5, \mu = 6.6, \sigma = \sqrt{0.64} = 0.8, n = 280

So

t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

t = \frac{6.5 - 6.6}{\frac{0.8}{\sqrt{280}}}

t = -2.09

The value of the test statistic is t = -2.09

4 0
4 years ago
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