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2 years ago

Please help, PhotoMath isn’t helping and I don’t understand

Mathematics

1 answer:

Pie2 years ago

4 0

Answer:

Option B

Step-by-step explanation:

As here,

In all the options processes in 3rd step .

As the bases are same exponents get added. 

And in Option B 3rd step it has been correctly done form of,

${ ({2}^{ \frac{1}{4} } )}^{4} = 4$

Is correct simplification.

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Can anyone help me with this?

AleksandrR [38]

Answer:

B.16 mins start from home to school or school to home

Step-by-step explanation:

I. When bike is faster than walk 3 times

Jane is in the middle of way to school

if she walk mid point to school is 4 mins

then mid point to home is 4 * 3 = 12 mins

School + Home = Total Mins

4 + 12 = 16

More discuss, leave comment below.

8 0

2 years ago

A sample of 50 drills had a mean lifetime of 12.17 holes drilled when drilling a low-carbon steel. Assume the population standar

zmey [24]

Using the z-distribution, it is found that the 95% confidence interval for the mean lifetime of this type of drill, in holes drilled, is (10.4, 13.94).

We are given the standard deviation for the population, hence, the z-distribution is used. The parameters for the interval is:

Sample mean of $\overline{x} = 12.17$
Population standard deviation of $\sigma = 6.37$
Sample size of $n = 50$ .

The margin of error is:

$M = z\frac{\sigma}{\sqrt{n}}$

In which z is the critical value.

We have to find the critical value, which is z with a p-value of $\frac{1 + \alpha}{2}$ , in which $\alpha$ is the confidence level.

In this problem, $\alpha = 0.95$ , thus, z with a p-value of $\frac{1 + 0.95}{2} = 0.975$ , which means that it is z = 1.96.

Then:

$M = 1.96\frac{6.37}{\sqrt{50}} = 1.77$

The confidence interval is the sample mean plus/minutes the margin of error, hence:

$\overline{x} - M = 12.17 - 1.77 = 10.4$

$\overline{x} + M = 12.17 + 1.77 = 13.94$

The 95% confidence interval for the mean lifetime of this type of drill, in holes drilled, is (10.4, 13.94).

A similar problem is given at brainly.com/question/22596713

6 0

2 years ago

PLZ GIMME A FRIEND REQUEST. IM LONELYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY

LekaFEV [45]

Answer:

Tamē kēvī rītē mitra vinantī ahīṁ mōkalī śakō chō

7 0

2 years ago

Read 2 more answers

If 75% of x is 18 then find the value of x?

VladimirAG [237]

Set up an equation:

0.75x = 18

Divide both sides by 0.75:

x = 18/0.75

x = 24

Answer: 24

7 0

2 years ago

Read 2 more answers

Alex gets paid $2.25 a tree for tree planting up north. In one week, he planted 437 trees. What is his wage?

Amiraneli [1.4K]

Answer:

Hey Beebzie

Dang he part of 20m trees? And is Alex a he or she, we'll never know, so I'll just refer to Alex as "it" to not gender appropriate anyone.

So it gets paid 2.25 for one tree. It planted 437 tress.

We take 2.25 x 437 to know the amount of money earned for all trees it planted.

The answer is $983.25, or A. I don't want to gender appropriate the letter "A" either because it could be option 1 or a different letter so I'll just say the answer again to not be sexist, $983.25

6 0

2 years ago