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2 years ago

1) what is the answer to (5²-7) ₃ 3

Mathematics

2 answers:

valentinak56 [21]2 years ago

8 0

Answer: 54

Explanation step by step: according to bidmas you must open the bracket first before any other thing. so the solution is 5×5-7×3

zheka24 [161]2 years ago

7 0

54 the answer is 54 hop that helped

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A city planner wants to estimate the average monthly residential water usage in the city. He selected a random sample of 100 hou

hodyreva [135]

Answer:

The 90% confidence interval for the average monthly residential water usage for all households in this city is between 4401.3 gallons and 4598.7 gallons.

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 Ztable as such z has a pvalue of $1-\alpha$ .

So it 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.

$M = 1.645*\frac{600}{\sqrt{100}} = 98.7$

The lower end of the interval is the sample mean subtracted by M. So it is 4500 - 98.7 = 4401.3 gallons

The upper end of the interval is the sample mean added to M. So it is 4500 + 98.7 = 4598.7 gallons

The 90% confidence interval for the average monthly residential water usage for all households in this city is between 4401.3 gallons and 4598.7 gallons.

4 0

2 years ago

Convert the following fraction to a decimal 4/13

Elden [556K]

Fraction: $\frac{4}{13} \\$

Decimal: 0.308

Explanation: $\frac{4}{13} \\$ means 4 ÷ 13. If you do that division, you get 0.3076 which can be rounded up to 0.308.

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2 years ago

Which pattern is non-linear?

Zielflug [23.3K]

Answer:

2, 4, 8, 16, 32

 is non-linear pattern

..........................................

Step-by-step explanation:

--------------------------------------

1st

-4+6=2

2+6=8

8+6=14

14+6=20

3rd

3+3=6

6+3=9

9+3=12

12+3=15

4th

5+4=9

9+4 =13

13+4=17

17+4=21

But 

2nd

2×2=4

4×2=8

8×2=16

16×2=32

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2 years ago

Factor the expression completely 2x^2-18

Nastasia [14]

Answer:

C)2(x-3)(x+3)

Step-by-step explanation:

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2 years ago

A bag contains 2 red, 4 blue, and 4 yellow marbles. What is the probability of pulling a red marble, putting the marble back, an

sdas [7]

Answer:

B.) 8%

Step-by-step explanation:

Answer: B.) 8%

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3 years ago