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3 years ago

Please help 19 math question

Mathematics

2 answers:

soldier1979 [14.2K]3 years ago

7 0

Answer: I would say 8 miles

Step-by-step explanation: Because north is up then he went west so 8 miles

DerKrebs [107]3 years ago

6 0

I think the answer is 8 miles

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Write two fractions multiplication expressions that are equivalent to the expression 3/4X2/3

kolbaska11 [484]

Answer:

1st fraction =

2/6*3/2

2nd fraction =

3/6*2/2

Step-by-step explanation:

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2 years ago

In ΔEFG, f = 86 inches, e = 64 inches and ∠E=32°. Find all possible values of ∠F, to the nearest degree.

Neporo4naja [7]

Answer:

Answer: 45 ∘ and 135 ∘

Step-by-step explanation:

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3 years ago

Then the chef decides to make more than 1 batch of the recipe.

tiny-mole [99]

Answer:

4 batches

Step-by-step explanation:

1 batch requires 3 cups apples and 1 cup blackberries

1 batch has (3+1) = 4 cups total of apples and blackberries

We use 16 cups of apples and blackberries

16/4 = 4

So we are multiplying by 4

That means 1batch*4 = 4 batches

7 0

3 years ago

–3x – 3 < –63 This is rlly needed.

NISA [10]

-3x -3 < -63 subtract the 3 first
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x < 20 is your answer

6 0

3 years ago

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