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earnstyle [38]
3 years ago
9

HELPPP!!! The dot plots below show rainfall totals in the Highlands and Lowlands areas of a certain region.

Mathematics
2 answers:
MrRissso [65]3 years ago
8 0

Answer:

i think its A tell me if i am wrong

Step-by-step explanation:

Minchanka [31]3 years ago
4 0

Answer:

i pretty sure its B

Step-by-step explanation:

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Help me please this is a test ASAP 30 points ???
Serga [27]

Answer:

\frac{2}{3}x-4\frac{2}{3}

3 0
3 years ago
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What is the solution to the system of equations graphed below?<br> y = -4x + 2<br> 6<br> y = x-3
Vikentia [17]

Answer:

y=14/5, x=29/5

Step-by-step explanation:

3 0
3 years ago
A cable 19 m long runs from the top of a utility pole to a point on the ground 10 m from the base of the pole. How tall is the u
Leviafan [203]

Answer:

16.2 m

Step-by-step explanation:

First, we can draw a picture. The cable goes from the top of the pole to the ground (with the pole on the right in my drawing), and the point on the ground is 10 m away from the base of the pole. This forms a right triangle, with the right angle being between the 10 m distance and the pole itself. We can then apply the Pythagorean Theorem, so

a²+b²=c², with c being the side opposite the right angle (the cable), getting us

10²+(length of pole)² = 19²

19²-10²=(length of pole)²

= 261

square root both sides to isolate the length of the pole

length of pole ≈ 16.2 m

5 0
3 years ago
Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800. A researcher from the a
Doss [256]

Using the z-distribution, it is found that she should take a sample of 46 students.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

\overline{x} \pm z\frac{\sigma}{\sqrt{n}}

The margin of error is:

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

In which:

  • \overline{x} is the sample mean.
  • z is the critical value.
  • n is the sample size.
  • \sigma is the standard deviation for the population.

In this problem, we have a 95% confidence level, hence\alpha = 0.95, z is the value of Z that has a p-value of \frac{1+0.95}{2} = 0.975, so the critical value is z = 1.96.

Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800, hence, by the Empirical Rule the standard deviation is found as follows:

6\sigma = 800 - 200

6\sigma = 600

\sigma = 100

The sample size is n when M = 29, hence:

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

29 = 1.96\frac{100}{\sqrt{n}}

29\sqrt{n} = 196

\sqrt{n} = \frac{196}{29}

(\sqrt{n})^2 = \left(\frac{196}{29}\right)^2

n = 45.67.

Rounding up, a sample of 46 students should be taken.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0
2 years ago
Find the solution set of the inequality -2x + 4 ≥≥ 2x - 8 from the replacement set {1, 2, 3}
dexar [7]
-2x+4≥2x-8, 12≥4x, 3≥x, x≤3 so all values in the set satisfy the equality.
5 0
3 years ago
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