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3 years ago

Can you pls answer and explain?

Mathematics

2 answers:

astraxan [27]3 years ago

8 0

If the boy is 3 feet tall and his shadow is 7 feet long, that is a dilation (increases in size) so you would divide 3 by 7 to get your rate of dilation. 3/7 is about 0.428. So if you want to know how tall the man is who casts a 14 feet long shadow is, you’d have to multiply 14 by .428 which you give you 5.992 which is about 6 feet tall.

Hope this helps

vesna_86 [32]3 years ago

6 0

18 ft bexause the shadow would be 4 feet taller than the actual person

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:) answer please! <3

Liula [17]

Answer:

Step-by-step explanation:

im pretty sure its 6, but i dont wanna be wrong

i mean i think it should be 6 i d k, is this like 6th grade math?

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3 years ago

Read 2 more answers

Find the ratio of the perimeters and the ratio of the areas of the larger rectangle to the smaller rectangle.

nydimaria [60]

Answer:

A.4/3 and 16/9

Step-by-step explanation:

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4 years ago

In the adjacent figure through = 50° calculate the, sĀr and rĀl

grigory [225]

Answer:

$\lim_{n \to \infty} a_n \geq \neq$

Step-by-step explanation:

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3 years ago

Historically, the mean yield of corn in the United States has been 120 bushels per acre with a standard deviation of 12. A surve

Illusion [34]

Answer:

$z=\frac{125-120}{\frac{12}{\sqrt{40}}}=2.64$

P-value

Since is a two sided test the p value would be:

$p_v =2*P(z>2.64)=0.0082$

And the best answer would be

B 0.0082

Step-by-step explanation:

Data given and notation

$\bar X=125$ represent the mean height for the sample

$\sigma=12$ represent the population standard deviation

$n=40$ sample size

$\mu_o =120$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the true mean is 120 or not, the system of hypothesis would be:

Null hypothesis: $\mu = 120$

Alternative hypothesis: $\mu \neq 120$

If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{125-120}{\frac{12}{\sqrt{40}}}=2.64$

P-value

Since is a two sided test the p value would be:

$p_v =2*P(z>2.64)=0.0082$

And the best answer would be

B 0.0082

4 0

3 years ago

A young person decides to put aside some money for retirement by putting $1,000 in a 30-year savings bond that pays 3.0% simple

Pavel [41]

Answer:

2427.26 $

Step-by-step explanation:

Just use this formula when you have such type of problems:

N = N° (1 + %)^t

Where N = final amount

N°= initial amount

t = peroid of time

Now let's solve:

N = 1000(1 + 0.03)^30

N = 2427.26

5 0

3 years ago