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3 years ago

Use an associative property to write an equivalent expression

Mathematics

1 answer:

Angelina_Jolie [31]3 years ago

3 0

Answer:

6y+3xy

Step-by-step explanation:

You can combine the y's together to get this answer

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Susan paid $240 to have her house decorated. The materials used to decorate the house coast $115, and service was charged at $5

Nataly [62]

Answer:

$240 =5x +115$

And we can solve for x in order to find the number hours using to decorate the house.

We can subtract in both sides 115 and we got:

$240-115= 5x$

$125 = 5x$

And now we can divide both sides by 5 and we got:

$x= 25$

So then the number of hours spent to decorate the house are 25

Step-by-step explanation:

Based on the information given we can model this function with this formula:

$y = mx+b$

Where y represent the total cost paid, m the cost per hour representing the slope and x the number of hours worked and finally b the initial cost for the materials. Then our function is given by:

$240 =5x +115$

And we can solve for x in order to find the number hours using to decorate the house.

We can subtract in both sides 115 and we got:

$240-115= 5x$

$125 = 5x$

And now we can divide both sides by 5 and we got:

$x= 25$

So then the number of hours spent to decorate the house are 25

8 0

3 years ago

Somebody pleaseee help :(

suter [353]

Answer:

answer is A fosha

Step-by-step explanation:

3 0

3 years ago

In the triangle ABC, the height AN = 24 in, BN = 18 in, AC = 40 in. Find AB and BC.

Basile [38]

Step-by-step Answer:

AN is height, so A is perpendicular to BC. (See image attached).

BN = 18

AN = 24

AC = 40

All as labeled.

ABN is a right triangle, with AB = sqrt(18^2+24^2)=sqrt(324+576)=30

ACN is a right triangle, with CN = sqrt(40^2-24^2)=sqrt(1600-576) = 32

BC = BN + NC = 18 + 32 = 50

8 0

4 years ago

The chamber of commerce of a Florida Gulf Coast community advertises that area residential property is available at a mean cost

Alja [10]

Answer:

a) In the step-by-step explanation.

b) The null and alternative hypothesis are:

$H_0: \mu=125000\\\\H_a:\mu> 125000$

c) P-value = 0.015

d) The conclusion, at a level of significance of 0.05, is that there is enough evidence to support the claim that that area residential property is available at a mean cost significantly higher than $125,000 per lot.

e) The claim of the chamber of commerce is false. We have statistical evidence against that claim and we can conclude that the mean prices are significantly higher than $125,000.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim, expressed in the alternative hypothesis, is that area residential property is available at a mean cost significantly higher than $125,000 per lot.

Then, the null and alternative hypothesis are:

$H_0: \mu=125000\\\\H_a:\mu> 125000$

The significance level is 0.05.

The sample has a size n=32.

The sample mean is M=130000.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=12500.

The estimated standard error of the mean is computed using the formula:

$s_M=\dfrac{s}{\sqrt{n}}=\dfrac{12500}{\sqrt{32}}=2209.71$

Then, we can calculate the t-statistic as:

$t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{130000-125000}{2209.71}=\dfrac{5000}{2209.71}=2.26$

The degrees of freedom for this sample size are:

$df=n-1=32-1=31$

This test is a right-tailed test, with 31 degrees of freedom and t=2.26, so the P-value for this test is calculated as (using a t-table):

$\text{P-value}=P(t>2.26)=0.015$

As the P-value (0.015) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that that area residential property is available at a mean cost significantly higher than $125,000 per lot.

6 0

3 years ago

PLZ PLEASE OMG PLEASE

STatiana [176]

Answer:

N=N so b

Step-by-step explanation:

Because in LN=NP the reflexive property essentially takes this info and repeats itself N=N

6 0

3 years ago