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2 years ago

Please right now I need help

Mathematics

2 answers:

zzz [600]2 years ago

7 0

Hello is the 3 i think

ollegr [7]2 years ago

6 0

Answer:

Step-by-step explanation:

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I need help with this math problem. I have a picture of the question.

Svetlanka [38]

Formula for distance between two points is

d∧2=(x2-x1)∧2+(y2-y1)∧2 in our case (x1,y1)=(k,q) and (x2,y2)=(0,0)

d∧2=(0-k)∧2+(0-q)∧2= k∧2+q∧2 => d=√(k∧2+q∧2)

Good luck!!!

4 0

3 years ago

Solve for t. −3t≥39 t≥−13 t≤13 t≥13 t≤−13

kozerog [31]

One solution was found : t ≤ -13 (Last answer choice)

Pull out like factors :

-3t - 39 = -3 • (t + 13)

Divide both sides by -3

Remember to flip the inequality sign:

Solve Basic Inequality :

Subtract 13 from both sides to get t≤−13

5 0

3 years ago

What is the slope of the line that passes through the points (-8, -1)(−8,−1) and (-6, -2) ?(−6,−2)? Write your answer in simples

ziro4ka [17]

The slope of line passing through the given points is: -1/2

Step-by-step explanation:

Given points are:

(x1,y1) = (-8,-1)

(x2,y2) = (-6,-2)

Slope is defined as the steepness of a line.

It is denoted by m.

The formula for slope is:

$m = \frac{y_2-y_1}{x_2-x_1}$

Putting the values

$m = \frac{-2-(-1)}{-6-(-8)}\\= \frac{-2+1}{-6+8}\\=\frac{-1}{2}$

The slope of line passing through the given points is: -1/2

Keywords: Slope, steepness

Learn more about slope at:

#LearnwithBrainly

3 0

3 years ago

A comic book store is having a sale you can buy 20 comic books for $35. what is the cost of 8 comic books during the sale

Elodia [21]

Answer:

$14

Step-by-step explanation:

35/20 = 1.75

8*1.75 = 14

4 0

3 years ago

Read 2 more answers

Use a sample n=1400 , p=0.20 and a 99% confidence level to construct a confidence interval estimate of the population proportion

saul85 [17]

Answer:

$0.2 - 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.172$

$0.2 + 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.228$

The 99% confidence interval would be given by (0.172;0.228)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by $\alpha=1-0.99=0.01$ and $\alpha/2 =0.005$ . And the critical value would be given by:

$z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58$

The confidence interval for the mean is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

If we replace the values given we got:

$0.2 - 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.172$

$0.2 + 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.228$

The 99% confidence interval would be given by (0.172;0.228)

7 0

3 years ago