3 years ago

Help me out I’m bad at this type of stuff

Mathematics

1 answer:

lina2011 [118]3 years ago

6 0

Answer:

the answer is 3 1/2 hours

Explanation: Just add all the fractions and numbers and subtract that by 9 1/4

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In monitoring lead in the air after the explosion at the battery factory, it is found that the amounts of lead over a 7 day peri

Andrew [12]

Answer:

$MOE=\pm \ 1.41$

Step-by-step explanation:

-Given that $\sigma=1.91, n=7$

-We determine the z-value corresponding to the 95% confidence level:

$z_{\alpha/2}=z_{0.025}=1.96$

-The margin of error is the degree of error from the real value and is calculated as follows:

$MOE=\pm z_{\alpha/2} (\frac{\sigma}{\sqrt{n}})\\\\=\pm z_{0.025}\times\frac{\sigma}{\sqrt{n}}\\\\=\pm 1.96\times \frac{1.91}{\sqrt{7}}\\\\=\pm 1.41$

Hence, the margin of error is $\pm 1.41$

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4 years ago

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Genrish500 [490]

Answer: -x because its more than one zero

Step-by-step explanation:

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3 years ago

8(1 + 5x) + 5= 13 + 5x

Rufina [12.5K]

Answer:

0 will be answer as shown in image

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4 years ago

23.78 to 1 decimal place

fomenos

Answer:

23.8

Step-by-step explanation:

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3 years ago

A rectangular window is topped with a semicircle on top. the height of the rectangular part is 1 more than 3 times its width , w

tensa zangetsu [6.8K]

In general for a rectangle of dimensions w by h and a semicircle of diameter w we get an area:

$A = wh + \frac 1 2 \pi (\frac w 2)^2$

The halfs are because a semicircle is half a circle and a radius is half a diameter.

We're told

$h = 1+ 3w$

Substituting,

$A(w) = w(1+3w) + \frac 1 2 \pi (\frac w 2)^2$

Answer: B

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3 years ago