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3 years ago

A book costs $4.75 plus sales tax. After sales tax, the book is $5.13. What is the approximate sales tax rate?

Mathematics

1 answer:

maria [59]3 years ago

6 0

Answer:

Step-by-step explanation:

5.13 - 4.75 = 0.38

4.75 / 0.38 = 12.5

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A piece of stained glass in the shape of a right triangle has sides measuring 8 centimeters 15 centimeters and 16 centimeters wh

Wittaler [7]

The answer would be...

a= 59.43 sq. cm

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3 years ago

A simple random sample of size nequals40 is drawn from a population. The sample mean is found to be 103.9, and the sample stand

yan [13]

Answer:

There is enough evidence to support the claim that the population mean is greater than 100

Step-by-step explanation:

Step 1: We state the hypothesis and identify the claim

$H_0:\mu=100$ and $H_1:\mu \:>\:100$ (claim)

Step 2: Calculate the test value.

$t=\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$

$\implies t=\frac{103.9-100}{\frac{21.9}{\sqrt{40} } }=1.1263$

Step 3: Find the P-value. The p-value obtained from a calculator is using d.f=39 and test-value 1.126 is 0.134

Step 4: We fail to reject the null hypothesis since P-value is greater that the alpha level. (0.134>0.05).

Step 5: There is enough evidence to support the claim that the population mean is greater than 100.

Alternatively: We could also calculate the critical value to obtain +1.685 for $\alpha=0.05$ and d.f=39 and compare to the test-value:

The critical value (1.685>1.126) falls in the non-rejection region. See attachment.

NB: The t- distribution must be used because the population standard deviation is not known.

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3 years ago

1 question for math............

Murrr4er [49]

Answer:

answer would be the first choice.

Step-by-step explanation:

you would need to factor out x from the expression, then factor out -3 from the expression, factor the expression using a^2-B^2=(a-b)(a+b), afterwards you factor out the 4 from the expression, and then the 3x. Next you would factor out 2x+1, reduce the expression with x-5, reduce the numbers with the greatest common divisor 2, you then reduce the expression with x-3, multiply the fractions, distribute 2 through the parenthesis, distribute the 3x through the parenthesis, and that should be all.

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3 years ago

Read 2 more answers

What’s the answer please

Galina-37 [17]

Answer:

0,∞

Thus, the range of the square root function is [0,∞)

Step-by-step explanation:

When its domain is greater than or equal to zero, its inverse is the squaring function. When its domain is all real numbers, its range includes complex numbers such as i, -1.

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3 years ago

What is the percent of decrease from 1,000 to 400?

Luden [163]

Answer:

400/1000×100%

40% is the percent of decrease from 1,000 to 400.

8 0

3 years ago