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3 years ago

If "x" is equal to 6, what is the value of the following expression? y = 2x + 9x + 3

Mathematics

1 answer:

ser-zykov [4K]3 years ago

3 0

Answer:

$y = 69$

Step-by-step explanation:

Given the following question:

$y=2x+9x+3$
$x=6$

Substitute and solve using PEMDAS:

$y=2x+9x+3$
$y=2(6)+9(6)+3$
$2\times6=12$
$y=12+9(6)+3$
$9\times6=54$
$y=12+54+3$
$12+54=66$
$66+3=69$
$y=69$

Your answer is "y = 69."

Hope this

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The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.

valina [46]

Answer:

A sample of 179 is needed.

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:

$\alpha = \frac{1 - 0.85}{2} = 0.075$

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 $1 - 0.075 = 0.925$ , so Z = 1.44.

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.

A previous study found that for an average family the variance is 1.69 gallon?

This means that $\sigma = \sqrt{1.69} = 1.3$

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

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

$0.14 = 1.44\frac{1.3}{\sqrt{n}}$

$0.14\sqrt{n} = 1.44*1.3$

$\sqrt{n} = \frac{1.44*1.3}{0.14}$

$(\sqrt{n})^2 = (\frac{1.44*1.3}{0.14})^2$

$n = 178.8$

Rounding up

A sample of 179 is needed.

7 0

3 years ago

In how many days will the inspectors come on the same day

Jet001 [13]

Answer:

depends on situations

Step-by-step explanation:

8 0

3 years ago

HELP! i know it looks easy but im not getting it. Select 2 strategies that we can use to subtract 563-192. Choose 2 answers: (Ch

nignag [31]

Answer:

Choice B & C

Step-by-step explanation:

563 - 192 = 371

The subtraction equals to 371.

100 + 90 + 210 = 400

The answer does not equal to 371 in choice A.

563 - 200 + 8 = 371

The answer equals to 371 in choice B.

571 - 200 = 371.

The answer equals to 371 in choice C.

8 0

4 years ago

Read 2 more answers

76 div 4 a)15 b) 8 c) 19 d) 0 Explain

Sunny_sXe [5.5K]

Answer:

C. 19.

Step-by-step explanation:

Let's find the answer.

Step 1: divide the first number of 76, which is 7, by 4 and find the integer part.

7/4=1.75, so the integer part is 1.

Step 2: subtract from 7 the (integer part times 4)

7-(1*4)=3

Step 3: put toether the result (3) and the second number of 76, which is 6, so the result is 36.

Step 4: find how many times we need to add 4s to reach 36, so:

4+4+4+4+4+4+4+4+4=36 which means that:

36/4=9

Step 5: put together the two resulted numbers calculated in step 1, which is 1, and step 4, which is 9:

1 and 9 giving 19, so the answer is:

76/4=19.

In conclusion the answer is C. 19.

6 0

3 years ago

3 ÷ 1/4. Home work again :(

sergiy2304 [10]

The answer is 12!

Hope this helps! :D

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4 0

3 years ago