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Oliga [24]
3 years ago
14

Please answer these 2 questions. I promise to mark as brainliest if you can solve with steps. Thank you.

Mathematics
1 answer:
neonofarm [45]3 years ago
6 0

Answer:

see explanation

Step-by-step explanation:

4

Since the triangles are similar then the ratios of corresponding sides are equal, that is

\frac{BC}{EF} = \frac{AB}{DE} ( substitute in values )

\frac{x-1}{18} = \frac{4}{12} ( cross- multiply )

12(x - 1) = 72 ( divide both sides by 12 )

x - 1 = 6 ( add 1 to both sides )

x = 7

------------------------------------------------------------------------------

5

The parallel line segment SV is half of RW

that is x = 7.5

SV also divides the sides RT and WT in proportion, that is

\frac{10}{3} = \frac{8}{y} ( cross- multiply )

10y = 24 ( divide both sides by 10 )

y = 2.4

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Answer:so the answer is 224 dollars

Step-by-step explanation:

30 percent of 320 is about 96 dollars saving

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Vinvika [58]
It's D, 3-2i.

Hope this helps
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A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 35 adult Americans an
Y_Kistochka [10]

Answer: a) 15, b) 1.

Step-by-step explanation:

A researcher studying public opinion of proposed social security changes obtains a simple random sample of 35 adult Americans and asks them whether or not they support the proposed changes. To say that the distribution of the sample proportion of adults who respond yes, is approximately normal, how many more Americans does the researcher need to sample in the following cases?

(a)    10% of all adult Americans support the changes

Here, np>5\ and\ n(1-p)>5

And , p=0.10

So, consider the equality, to find the value of 'n'.

np=5\\\\n\times 0.10=5\\\\n=\dfrac{5}{0.10}\\\\n=50

So, there are 50-35=15 more adult Americans needed.

(b)   15% of all adult Americans supports the changes

Here, p=0.15

So, again we get that

np=5\\\\n\times 0.15=5\\\\n=\dfrac{5}{0.15}\\\\n=33.33\\\\n\approx 34

So, there are 35-34=1 more adult Americans needed.

Hence, a) 15, b) 1.

5 0
3 years ago
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77julia77 [94]

Answer:

D

Explanation:

I'm just typing this part to get to 20 characters

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