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Svetradugi [14.3K]
3 years ago
5

Combine

Mathematics
2 answers:
Irina18 [472]3 years ago
6 0

The correct answer is D) a + 2b.

In order to find the answer to this problem, first group the like terms. Start with the a terms.

2a - a = a

Now do the same with the b terms.

-3b + 5b = 2b.

Now that we have each of these answers, we can put them together to form 1 + 2b, which is your final answer.

RideAnS [48]3 years ago
5 0

add like terms

 2a - 3b + 5b - a

= (2a - a)  +  (-3b + 5b)

=     a       +      2b

Answer: D) a + 2b

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The Damon family owns a large grape vineyard in western New York along Lake Erie. The grapevines must be sprayed at the beginnin
vazorg [7]

Answer:

z=\frac{0.0955-0.0611}{\sqrt{0.08(1-0.08)(\frac{1}{440}+\frac{1}{360})}}=1.784    

p_v =2*P(Z>1.784) =0.074  

Comparing the p value with the significance level given \alpha=0.1 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can say that the two proportions differes at 10% of significance.

Step-by-step explanation:

Data given and notation  

X_{1}=42 represent the number of infested vines for Pernod5

X_{2}=22 represent the number of infested vines for Action

n_{1}=440 sample of Pernod5

n_{2}=360 sample of Action

\hat p_{1}=\frac{42}{440}=0.0955 represent the proportion of residents of  infested vines for Pernod5

\hat p_{2}=\frac{22}{360}=0.0611 represent the proportion of infested vines for Action

z would represent the statistic (variable of interest)  

p_v represent the value for the test (variable of interest)  

\alpha=0.1 significance level given

Concepts and formulas to use  

We need to conduct a hypothesis in order to check if is there is a difference between thw two population proportions, the system of hypothesis would be:  

Null hypothesis:p_{1} - p_{2}=0  

Alternative hypothesis:p_{1} - p_{2} \neq 0  

We need to apply a z test to compare proportions, and the statistic is given by:  

z=\frac{\hat p_{1}-\hat p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{1}})}}   (1)  

Where \hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{42+22}{440+360}=0.08  

z-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  

Replacing in formula (1) the values obtained we got this:  

z=\frac{0.0955-0.0611}{\sqrt{0.08(1-0.08)(\frac{1}{440}+\frac{1}{360})}}=1.784    

Statistical decision

Since is a two sided test the p value would be:  

p_v =2*P(Z>1.784) =0.074  

Comparing the p value with the significance level given \alpha=0.1 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can say that the two proportions differes at 10% of significance.

4 0
3 years ago
Please help I’m being timed on this! ://
Llana [10]

Answer:

its going to be D (x,y) - (x-2,y-4)

Step-by-step explanation:

3 0
3 years ago
Can one of y’all hep me pls
givi [52]

Answer:

3 1/3 pizzas

Step-by-step explanation:

Since each boy ate 2/3 of a pizza and there were 5 boys total, you would multiple the two fractions.

The two fractions in this case would be 2/3 and 5/1.

The product is 10/3.

The mixed number would come out to 3 1/3.

6 0
2 years ago
-13 -1/5 divided by 4 -2/5
loris [4]

Answer:

The answer is -8.8

Step-by-step explanation:

so -13-1/5 divided by 4-2.5  is     -13.2/1.5 which is -8.8

Hope this is helpful

7 0
3 years ago
Write the answer in simplest form: 4/15 + 3/7 a. 73/105 b. 7/22 c. 4/35 d. 1/15
elena-s [515]

Answer:

all work is shown and pictured

3 0
3 years ago
Read 2 more answers
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