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Gnom [1K]
2 years ago
15

Julie is buying chocolate chip and oatmeal cookies

Mathematics
1 answer:
Elina [12.6K]2 years ago
8 0

Answer:

25 CHOCOLATE  COOKIE COST 6.25

25  OATMEAL COOKIE COST 5.00

Step-by-step explanation:

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Solve for x.<br><br><br> A.90<br> B.100<br> C.135<br><br><br><br><br> HELP ME
ipn [44]

Answer:

its B

Step-by-step explanation:

5 0
3 years ago
DC = 10 What is the measure of angle ABD?
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Write 5.6% as a decimal
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A simple random sample of electronic components wil be selected to test for the mean lifetime in hours. Assume that component li
Serjik [45]

Answer:

189 components must be sampled.

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 - 0.99}{2} = 0.005

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.005 = 0.995, so Z = 2.575.

Now, find the margin of error M as such

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

Assume that component lifetimes are normally distributed with population standard deviation of 16 hours.

This means that \sigma = 16

How many components must be sampled so that a 99% confidence interval will have margin of error of 3 hours?

n components must be sampled.

n is found when M = 3. So

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

3 = 2.575\frac{16}{\sqrt{n}}

3\sqrt{n} = 2.575*16

\sqrt{n} = \frac{2.575*16}{3}

(\sqrt{n})^2 = (\frac{2.575*16}{3})^2

n = 188.6

Rounding up:

189 components must be sampled.

4 0
3 years ago
Solve for x. (RIGHT ANSWER WILL GET BRAINLIEST)
puteri [66]

Answer:

67

Step-by-step explanation:

The angle with x in it is a vertical angle to the other one labeled & the right angle put together.

Therefore:

48 + 90 = 2x + 4

Solve for x:

138 = 2x + 4

138 - 4 = 2x + (4-4)

134 = 2x

134/2 = 2x/2

X = 67

Hope this helps! Have a great day!

7 0
2 years ago
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