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3 years ago

I need help please!1

Mathematics

2 answers:

krok68 [10]3 years ago

8 0

Answer:

It's B for the first one.

For the second one, it is C

Step-by-step explanation:

30 * 0.3 = 9

So 30% of 30 is 9. She did 9 windows.

0.52 = 52/100

It's 52/100 because 0.52 = 52%. 52% then equals 52/100.

52/100 = 13/25

So the answer is 13/25

Nutka1998 [239]3 years ago

7 0

Answer:

for the first picture, she cleans 30 windows

the second picture is 52/100 :)

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Use a one-sample t ‑test, based on the data below, to test the null hypothesis H0:µ=100.63 against the alternative hypothesis H1

Sati [7]

Answer:

The standard error (SE) is 0.1847.

The t-statistic for this test is 2.490.

Step-by-step explanation:

We are given that the sample has a mean of $\bar X$ = 101.09 and a standard deviation of s = 0.4887 .

Also, the 7 sample values are also given.

Let $\mu$ = population mean.

So, Null Hypothesis, $H_0$ : $\mu$ = 100.63

Alternate Hypothesis, $H_1$ : $\mu$ > 100.63

The test statistics that would be used here One-sample t test statistics as we don't know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean = 101.09

s = sample standard deviation = 0.4887

n = sample values = 7

The Standard Error (SE) is given by = $\frac{s}{\sqrt{n} }$ = $\frac{0.4887}{\sqrt{7} }$ = 0.1847

So, test statistics = $\frac{101.09-100.63}{\frac{0.4887}{\sqrt{7} } }$ ~ $t_6$

= 2.490

The value of t test statistics is 2.490.

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3 years ago

Determine the present value P that must be invested to have the future value A at simple interest rate r after time t A=$7000.00

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Answer:

yes

Step-by-step explanation:

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The number 15, _56 rounded to the nearest thousand is 15,000. What number is the missing digit? Explain.

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The missing digit could be any number from 0-4 because if it were any from 5-9 then it would be rounded to 16,000.

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3 years ago

A ratio can be simplified.

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Answer:

Yes, a ratio can be simplified.

Step-by-step explanation:

An example of this is 5:10, where it can be simplified down to 1:2.

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3 years ago

8^x=2 write down the value of x

e-lub [12.9K]

Answer:

x = $\frac{1}{3}$

Step-by-step explanation:

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$(2^3)^{x}$ = $2^{1}$ , that is

$2^{3x}$ = $2^{1}$

Since the bases on both sides are equal, equate the exponents

3x = 1 ( divide both sides by 3 )

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3 years ago