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Mrac [35]
3 years ago
10

What’s the value of x

Mathematics
2 answers:
Readme [11.4K]3 years ago
8 0
10+2x = 18
2x = 8
x = 4

answer is B
x = 4
Jet001 [13]3 years ago
5 0
10+2x=18
2x=8
x=4
So the answer is 4
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Y=1/4x+5<br> y=-x<br>what are the x and y values, I think I'm supposed to use substitute​
I am Lyosha [343]

Answer:

the answer are x=4y-20

and x represents the independent variable and y represents the dependent variable

5 0
3 years ago
What is the answer?900+26
kompoz [17]
The answer is 926 :)))
i hope this is helpful
have a nice day 
7 0
3 years ago
According to sleep researchers, if you are between the ages of 12 and 18 years old, you need 9 hours of sleep to be fully functi
Alexxx [7]

Answer:

d) H0:μ=9 and Ha:μ<9

t=\frac{7.9-9}{\frac{2.1}{\sqrt{28}}}=-2.77    

p_v =P(t_{(27)}  

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, we can conclude that the true mean is significantly lower than 9 hours at 5% of signficance.  

Step-by-step explanation:

Data given and notation  

\bar X=7.9 represent the sample mean

s=2.1 represent the sample standard deviation

n=28 sample size  

\mu_o =9 represent the value that we want to test

\alpha represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

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

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the students at this high school are getting too little sleep, the system of hypothesis would be:  

Null hypothesis:\mu \geq 68  

Alternative hypothesis:\mu < 68  

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-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".  

The best option for this case would be:

d) H0:μ=9 and Ha:μ<9

Calculate the statistic

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

t=\frac{7.9-9}{\frac{2.1}{\sqrt{28}}}=-2.77    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=28-1=27  

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

p_v =P(t_{(27)}  

Conclusion  

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, we can conclude that the true mean is significantly lower than 9 hours at 5% of signficance.  

8 0
3 years ago
6. An air conditioning repair service call costs $75 per hour plus a flat fee trip charge of $25. If the situation can
Talja [164]

Answer:

THE ANSWER FROM YOUR OPTIONS IS:

(C) The repair charge r depends on the repair time h in hours.

Step-by-step explanation:

Repair-service call  -  $75 /hour

Flat fee trip-charge  -  $25

The function representing this situation: r(h) = 75h + 25

(A) Which is the dependent variable?

The dependent variable is the one whose value is to be gotten from the relationship between or among the values of other variables in the function. It usually appears at the left hand side of the equation. In this case, it is r(h).

(B) What do the variables represent?

The variables here - the algebra that can attain various values - are r and h.

r = total repair charges

h = repair time in hours [hence, if h = 1, repair time is 1 hour]

These are the two variables in this function.

r(h) now means repair charges in hours

THE ANSWER FROM YOUR OPTIONS IS:

(C) The repair charge r depends on the repair time h in hours.

5 0
3 years ago
Teresa's sugar cookie recipe calls for 2 1/3 cups of sugar. How much
djyliett [7]

Answer:

Hi, so one batch of the sugar cookie recipe calls for 2 1/3 cups of sugar. SO to make 2 1/2 batches you would have to first multiply 2 1/3 times 2, to get 4 2/3. then split 2 1/3 in half for the other half of the recipe. that would be 1 1/6. then add 1 1/6 plus 4 2/3 to get your answer of <u><em>6 cups of sugar.</em></u>

Step-by-step explanation:

Have a great day. please mark brainliest

5 0
3 years ago
Read 2 more answers
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