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3 years ago

Find the slope of the line passing through (-3, 4) and (1, -7) URGENT PLEASE HURRY

Mathematics

2 answers:

deff fn [24]3 years ago

5 0

Answer:

$slope=\frac{1-(-3)}{(-7-4)}= -\frac{4}{11}$

Step-by-step explanation:

Formula to calculate slope (m) is given as

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

here

$(x_1, y_1)=(-3, 4)$

and

$(x_2, y_2)=(1, -7)$

xeze [42]3 years ago

3 0

Step-by-step explanation:

y=11x-5 or something like that.. I'm not sure on the ending

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Test the null hypothesis Upper H 0 : (mu 1 minus mu 2 )equals 0H0: μ1−μ2=0 versus the alternative hypothesis Upper H Subscript a

Law Incorporation [45]

Answer:

The test statistic t is t=2.9037.

The null hypothesis is rejected.

For a significance level of 0.05, there is enough evidence to support the alternative hypothesis.

Step-by-step explanation:

The question is incomplete:

The sample 1, of size n1=25 has a mean of 1.15 and a standard deviation of 0.31.

The sample 2, of size n2=25 has a mean of 0.95 and a standard deviation of 0.15.

This is a hypothesis test for the difference between populations means.

The null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a:\mu_1-\mu_2\neq 0$

The significance level is α=0.05.

The difference between sample means is Md=0.2.

$M_d=M_1-M_2=1.15-0.95=0.2$

The estimated standard error of the difference between means is computed using the formula:

$s_{M_d}=\sqrt{\dfrac{\sigma_1^2+\sigma_2^2}{n}}=\sqrt{\dfrac{0.31^2+0.15^2}{25}}\\\\\\s_{M_d}=\sqrt{\dfrac{0.119}{25}}=\sqrt{0.005}=0.069$

Then, we can calculate the t-statistic as:

$t=\dfrac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\dfrac{0.2-0}{0.069}=\dfrac{0.2}{0.069}=2.9037$

The degrees of freedom for this test are:

$df=n_1+n_2-1=25+25-2=48$

This test is a two-tailed test, with 48 degrees of freedom and t=2.9037, so the P-value for this test is calculated as (using a t-table):

$P-value=2\cdot P(t>2.9037)=0.0056$

As the P-value (0.0056) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

8 0

3 years ago

The sales tax in your city is 8.8%, and an item costs $55 dollars before tax. How much would you pay for that item?

IRISSAK [1]

Answer:

The answer is $ 59.84

Step-by-step explanation:

Ok, I know this is not one of the options, but hear me out:

To find the sales tax for that item, you need to multiply the dollar amount by the sales tax (in percent):

$55 * 8.8% = $4.84

So the sales tax is $4.84. However, the question asks "How much would you pay for that item?", not what the sales tax is. So I would solve this problem by adding the sales tax to the dollar amount of the item:

$55 + $4.84 = $ 59.84

If you are able to write or type your answer, I would type $ 59.84. If you can only select one of the given values, then I would suggest going with A: $ 4.84 just because its the only number that is actually relevant at all to the problem.

7 0

3 years ago

Read 2 more answers

The proportional relationship between the number of hours a business operates and its total cost of electricity is shown in the

aalyn [17]

Answer:

The answer is A.

Step-by-step explanation:

6 0

2 years ago

Which number line represents the solution of x + 3 > 2?

Ghella [55]

Answer:

x > -1

(-1, infinity)

Step-by-step explanation:

6 0

3 years ago

Help!

Galina-37 [17]

Answer:

Step-by-step explanation:

Note:

1 gal = 4 quarts

1 pint = 0.5 quart

Re-writing all the choices in dollars and quarts and calculating how much each quart costs

A) $1 per 1 quart

B) $2 per gallon = $2 per 4 quarts = $2 ÷ 4 quarts = $0.50 per quart

C) $1.50 per 2 quarts = $1.50 ÷ 2 quarts = $0.75 per quart

D) $0.50 per 1 pint = $0.50 per 0.5 quart = $0.50 ÷ 0.5 quart = $1 per quart

If you compare all of the above, it is clear that answer B ($0.50 per quart) is the cheapest rate and hence the best deal.

6 0

3 years ago