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kari74 [83]
3 years ago
5

Please help me I will give brainlist

Mathematics
2 answers:
musickatia [10]3 years ago
7 0

2n + 3

1 and 3 are like terms, and because there are no more variables, the 2n will stay alone :)

Elena L [17]3 years ago
5 0

Answer:

3 + 2n

Step-by-step explanation:

2 + 1 = 3.

2n cannot be added into this because it has a letter in front of it. Therefore, it stays on its own.

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Ifx=−8, evaluate the following expression:(x−2)(x+4)x(x+9)
tekilochka [14]

Answer:

= 40

Step-by-step explanation:

so if you mean x = -8

(x - 2)(x + 4) \times (x + 9) \\

( - 8 - 2)( - 8 + 4) \times ( - 8 + 9)

( - 10)( - 4) \times 1

40 \times 1

40

4 0
2 years ago
Distribute to create an equivalent expression with the fewest symbols possible.<br>4(x - 2 + y) =
kifflom [539]

Answer:

4x-8+4y

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
Anybody please help me
vladimir1956 [14]

Answer:

reflection over the y axis

Step-by-step explanation:

4 0
2 years ago
WILL GIVE BRAINLIEST TO CORRECT ANSWER
Aliun [14]

Answer:

Total number of outcomes = 23

number of biology and art students = 2

number of biology students = 2

Since it is given that all the students study art,

number of possible outcomes = 2

probability = number of favorable outcomes/number of total outcomes.

= 2/23

Therefore probability that the selected student studies both art and biology is 2/23.

7 0
3 years ago
A average amount of money on deposit in a savings account is $7500. Suppose a random sample of 49 accounts shows the average in
Valentin [98]

Answer:  

z=-3.79

p_v =2*P(z  

Step-by-step explanation:  

1) Data given and notation  

\bar X=6850 represent the mean average amount of money on deposit in savings account for the sample  

\sigma=1200 represent the population standard deviation for the sample  

n=49 sample size  

\mu_o =7500 represent the value that we want to test

\alpha=0.01 represent the significance level for the hypothesis test.  

z would represent the statistic (variable of interest)  

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

2) State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean for the amount of money on deposit in savings account differs from 7500, the system of hypothesis would be:  

Null hypothesis:\mu =7500  

Alternative hypothesis:\mu \neq 7500  

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

3) Calculate the statistic  

We can replace in formula (1) the info given like this:  

z=\frac{6850-7500}{\frac{1200}{\sqrt{49}}}=-3.79  

4)P-value  

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

p_v =2*P(z  

5) Conclusion  

If we compare the p value and the significance level given \alpha=0.01 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the average amount of money deposit in savings account its significantly different from 7500 tons at 1% of signficance.  

7 0
3 years ago
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