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3 years ago

9+a/6=8 need help is

2 answers:

4 0

A = -6

order of operations does division first, but you have to know that you must add -1 to 9 in order to get 8. Therefore, you must have a negative number over 6 and it has to be -6 in order for that negative number to be -1

coldgirl [10]3 years ago

4 0

<span>9+a/6=8
Subtract 9 from both sides
a/6= -1
Multiply 6 on both sides so that the only thing remaining on the left side is the variable a.
Final Answer: a = -6</span>

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A woman at a grocery store wanted to purchase a 5 pound bag of apples but thought she would first weigh the bag on the store sca

alex41 [277]

Answer:

Step-by-step explanation:

here we are interested to test the mean weight of a bag is less than 5 pound.

So null hypothesis is $H_0:\mu =5$

and alternative hypothesis is $H_1:\mu$

Let's do one sample z test.

The given information Sample size = n =100

sample mean $\overline{X}=4.38$ ,

standard deviation $\sigma =0.5$

Test statistic:Z= $\frac{\overline{X}-\mu }{\frac{\sigma }{\sqrt{n}}}$

Z= $\frac{4.38-5}{\frac{0.5}{\sqrt{100}}}=-12.4$

This is a left tailed test, hence the p value for the left tailed test and Z score= -12.4 is $\approx$ 0

Hence We can reject the null hypothesis to say that we have evidence that apple bag weight at the grocery store is less than 5 pounds and it is not a chance variation

3 0

3 years ago

Pls help i dont understand this!!!

scoundrel [369]

Answer:

I guess x =4 and y =2

I hope it helps

7 0

3 years ago

The amount of soft drink in a bottle is a Normal random variable. Suppose that in 7% of the bottles containing this soft drink t

WITCHER [35]

Answer:

The mean is 15.93 ounces and the standard deviation is 0.29 ounces.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

7% of the bottles containing this soft drink there are less than 15.5 ounces

This means that when X = 15.5, Z has a pvalue of 0.07. So when X = 15.5, Z = -1.475.

$Z = \frac{X - \mu}{\sigma}$

$-1.475 = \frac{15.5 - \mu}{\sigma}$

$15.5 - \mu = -1.475\sigma$

$\mu = 15.5 + 1.475\sigma$

10% of them there are more than 16.3 ounces.

This means that when X = 16.3, Z has a pvalue of 1-0.1 = 0.9. So when X = 16.3, Z = 1.28.

$Z = \frac{X - \mu}{\sigma}$

$1.28 = \frac{16.3 - \mu}{\sigma}$

$16.3 - \mu = 1.28\sigma$

$\mu = 16.3 – 1.28\sigma$

From above

$\mu = 15.5 + 1.475\sigma$

$15.5 + 1.475\sigma = 16.3 – 1.28\sigma$

$2.755\sigma = 0.8$

$\sigma = \frac{0.8}{2.755}$

$\sigma = 0.29$

The mean is

$\mu = 15.5 + 1.475\sigma = 15.5 + 1.475*0.29 = 15.93$

The mean is 15.93 ounces and the standard deviation is 0.29 ounces.

6 0

3 years ago

Which series of transformations takes the graph of f(x)=3x−8 to the graph of g(x)=−3x+12 ?

kumpel [21]

<span> reflect the graph about the x-axis and translate 4 units down </span>

4 0

3 years ago

Read 2 more answers

John made a small rectangular table for his workroom. If the sides of the table are 32 inches and 26 inches, what should the tab

matrenka [14]

Answer:

The table should measure diagonally about 41.23 inches.

Step-by-step explanation:

To find the diagonal of a rectangle we use the formula :

$a^{2}$ + $b^{2}$ = $c^{2}$

A and B both represent the side lengths of the rectangle, while C is the diagonal part. Knowing this formula, let's plug in the values for A and B and see what happens.

$32^{2}$ + $26^{2}$ = $c^{2}$

1024 + 676 = $c^{2}$

1700 = $c^{2}$

The square root of 1700 is (rounded to the hundreth's place) = 41.23

6 0

3 years ago