B) Which is the better -17%off35$or12%off32?

Which of the following is the simplified form of the expression -x(x - y) + 4xy - x2?

Leokris [45]

-x+xy +4xy-x2
-2x2+5xy
C.-2x2+5xy

6 0

3 years ago

PLZ PLS PLZ ANSWER BOTH OF THESE!!!!!!!!

trapecia [35]

The first one is C because on a coordinate plane is you count the number of spaces between them it’s 7 side to side( horizontal) and the second one is quadrant 2 because when reflecting across the y axis you move over the y axis which is why it’s quadrant 2. Hope this helps!

5 0

3 years ago

Read 2 more answers

A yodeler ascends a mountain to its peak to do some sweet yodeling. The peak is 5,800 ft above sea level. The yodeler then desce

Vesna [10]

If the yodeler is at 5800 ft above sea level.....and he descends 200 ft....he will then be at (5800 - 200) = 5600 ft above sea level where he meets his friend

6 0

4 years ago

Given the equation: y = 3 (2x - 1) Complete the table of values. y - 1 0 9

Schach [20]

Answer:

Any line can be graphed using two points. Select two x x values, and plug them into the equation to find the corresponding y y values.

Step-by-step explanation:

5 0

3 years ago

N experiment was conducted to test the effect of a new stain remover. Twenty stains were treated with stain remover A and stain

Klio2033 [76]

Answer:

For this case the statistic calculated is $t= 1.37$

$p_v =0.17$

So the p value is a very high value and using the significance level given $\alpha=0.1$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and there is enough evidence to conclude that we have a difference between the two means at 10% of significance.

Step-by-step explanation:

Data given and notation

$\bar X_{A}$ represent the mean for the sample for A

$\bar X_{B}$ represent the mean for the sample B

$s_{A}$ represent the sample standard deviation for the sample A

$s_{B}=$ represent the sample standard deviation for the sample B

$n_{A}=20$ sample size for the group poisoned

$n_{B}=20$ sample size for the group unpoisoned

t would represent the statistic (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to check if the two means are equal or not , the system of hypothesis would be:

Null hypothesis: $\mu_{A} - \mu_{B} =0$

Alternative hypothesis: $\mu_{A} - \mu_{B} \neq 0$

For this case is better apply a t test to compare means, and the statistic is given by:

$t=\frac{\bar X_{A}-\bar X_{B}}{\sqrt{\frac{s^2_{A}}{n_{A}}+\frac{s^2_{B}}{n_{B}}}}$ (1)

t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.

Calculate the statistic

For this case the statistic calculated is $t= 1.37$

Statistical decision

The significance level is 0.1 $\alpha=0.1$ , but we can calculate the p value for this test. The first step is calculate the degrees of freedom, on this case:

$df=n_{A}+n_{B}-2$

The p value on this case is given

$p_v =0.17$

So the p value is a very high value and using the significance level given $\alpha=0,1$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and there is enough evidence to conclude that we have a difference between the two means at 10% of significance.

5 0

3 years ago