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Setler [38]
2 years ago
5

The price of an item has dropped to $33 today.yesterday it was $110.find the percentage decrease

Mathematics
1 answer:
asambeis [7]2 years ago
3 0

Answer: 110 - 33 equals 77.

Step-by-step explanation:

Dude, just subtract- (if I get this wrong I’m sorry)

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How many women must be randomly selected to estimate the mean weight of women in one age group? We want 90% confidence that the
ki77a [65]

Answer:

155 women must be randomly selected.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.9}{2} = 0.05

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a pvalue of 1 - 0.05 = 0.95, so Z = 1.645.

Now, find the margin of error M as such

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

In which \sigma is the standard deviation of the population and n is the size of the sample.

The population standard deviation is known to be 28 lbs.

This means that \sigma = 28

We want 90% confidence that the sample mean is within 3.7 lbs of the populations mean. How many women must be sampled?

This is n for which M = 3.7. So

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

3.7 = 1.645\frac{28}{\sqrt{n}}

3.7\sqrt{n} = 1.645*28

\sqrt{n} = \frac{1.645*28}{3.7}

(\sqrt{n})^2 = (\frac{1.645*28}{3.7})^2

n = 154.97

Rounding up:

155 women must be randomly selected.

4 0
3 years ago
Simplify the following expression.<br> log(x^4) -log(x^3)
Paraphin [41]
The answer would be log(x)
3 0
2 years ago
HELP ME SOMEOME PLEASE!!!!!​
mart [117]

Problem 1

For functions like f(x), the input is x and the output is f(x).

If x = 7, then f(7) = 12 has the input 7 and output 12.

Therefore the ordered pair is (7, 12) which is the answer

=====================================================

Problem 2

Replace every x with 3 and simplify

f(x) = 3*x

f(3) = 3*3

f(3) = 9

The input x = 3 leads to the output y = 9. Recall that y = f(x).

So (3,9) is the answer here.

7 0
3 years ago
Five names for number 64
yanalaym [24]
Sixty four

6 tens 4 ones

64 ones

60+4

8 to the power of 2

5 0
2 years ago
You invest $350 in an account with an interest rate of 1.2% compounded continuously. How much money would be in the account afte
kozerog [31]
Change 1.2%into decimal you will get 0.012
then multiply 350 by 0.012 you got the answer
then add the 0.012 with the 10 you will get 10.012
at the end round your answer to the whole number
5 0
3 years ago
Read 2 more answers
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