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3 years ago

PLEASE HELP NEED HELP!

Mathematics

1 answer:

nataly862011 [7]3 years ago

4 0

X is across and Y is up and down
0,5 2,4 4,3 6,2 8,1 10,0

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What are the slope and why intercept shown on the graph below

viktelen [127]

Hello!

Let's start by finding the slope of the line. You can calculate the slope by dividing the change in y-values by the change in x-values using the following formula:

$\frac{ y_{1}- y_{2} }{ x_{1} - x_{2} }$

The plotted coordinates are (0, 5) and (4, -5); let's plug those into the formula:

$\frac{5(-5)}{0-4}$

Simplify:

$\frac{5+5}{-4}$

$\frac{10}{-4}$

$\frac{-5}{2}$

The slope is $\frac{-5}{2}$ .

Now, the y-intercept is where the line intersects the y-axis, or when x equals 0. x equals 0 when y equals 5, so the y-intercept is 5.

I hope this helps!

3 0

3 years ago

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7. On a map of a local community college, the cafeteria is located at point (-4,3) and the

marishachu [46]

Answer: C. 10.2

Step-by-step explanation: because in decimal form 10.19803902 to the nearest is 10.2

7 0

3 years ago

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PLEASE HELP

Inessa [10]

Answer:

the measure of the missing length is 3 mi

Step-by-step explanation:

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6 0

3 years ago

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An environmental group conducted a study to determine whether crows in a certain region were ingesting food containing unhealthy

nydimaria [60]

Part A

Given info:

xbar = sample mean = 4.90 ppm
s = sample standard deviation = 1.12 ppm
n = 23 = sample size

Because n > 30 is not true, and we don't know the population standard deviation (sigma), this means we must use a T distribution.

The degrees of freedom here are n-1 = 23-1 = 22.

At 90% confidence and the degrees of freedom mentioned, the t critical value is roughly t = 1.717

Use a T distribution table or calculator to determine this. If you don't have a calculator for the task, then you can search out "inverse T calculator" and there are tons of free options to pick from.

The margin of error E is

E = t*s/sqrt(n)

E = 1.717*1.12/sqrt(23)

E = 0.400982

This is approximate and accurate to 6 decimal places.

The confidence interval is going to be xbar plus or minus that E value

L = lower bound = xbar - E = 4.90 - 0.400982 = 4.499018 = 4.50

U = upper bound = xbar + E = 4.90 + 0.400982 = 5.300982 = 5.30

The confidence interval in the format of (L, U) is (4.50, 5.30)

You could also express it as the format L < mu < U and it would be 4.50 < mu < 5.30; however, I'll stick to the first method.

<h3>Answer: (4.50, 5.30)</h3>

=====================================================

Part B

Since we know sigma = 2.6 is the population standard deviation, we can use a Z distribution now.

At 90% confidence, the z critical value is roughly 1.645; use a table or calculator to determine this.

$n = \left(\frac{z*\sigma}{E}\right)^2\\\\n \approx \left(\frac{1.645*2.6}{0.03}\right)^2\\\\n \approx 20325.254444 \\\\$

Round this up to the nearest integer to get 20326. For min sample size problems, <u>always</u> round up.

<h3>Answer: 20326</h3>

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2 years ago

Write the number 2.7 x 10^-3

spayn [35]

Answer:

0.0027 - zero-point-zero-zero-twenty-seven

Step-by-step explanation:

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3 years ago

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