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WITCHER [35]
3 years ago
11

Can someone please help me with this page and show work ?!?! I’m struggling with this will give brainleist!

Mathematics
1 answer:
egoroff_w [7]3 years ago
3 0
You can download this app called photo math and take a pic of it and it tells you the answer
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Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.
zhannawk [14.2K]

The answer is -3.

To find this, we simply have to solve the equation and leave only the blank and the parenthesis that it is with on the right side. Then we can divide by the parenthesis. The work for this is done for you below.

____(x - 3) + 2x = -(x - 5) + 4 ----> Distribute the -1 to the parenthesis.

____(x + 3) + 2x = -x + 5 + 4 ----> Simplify

____(x + 3) + 2x = -x + 9 ----> Subtract 2x from both sides

____(x + 3) = -3x + 9 ------> Divide both sides by x + 3

____ = -3.

7 0
3 years ago
Read 2 more answers
It is claimed that automobiles are driven on average more than 20,000 kilometers per year. To test this claim, 100 randomly sele
kow [346]

Answer:

t=\frac{23500-20000}{\frac{3900}{\sqrt{100}}}=8.974      

p_v =P(t_{99}>8.974)=9.43x10^{-15}  

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we to reject the null hypothesis, and the actual mean is significantly higher than 20000.      

Step-by-step explanation:

1) Data given and notation      

\bar X=23500 represent the sample mean  

s=3900 represent the sample standard deviation      

n=100 sample size      

\mu_o =2000 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 determine if the true mean is higher than 20000, the system of hypothesis would be:      

Null hypothesis:\mu \leq 2000      

Alternative hypothesis:\mu > 2000      

We don't know the population deviation, so for this case 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".  

Calculate the statistic      

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

t=\frac{23500-20000}{\frac{3900}{\sqrt{100}}}=8.974      

Calculate the P-value      

First we need to calculate the degrees of freedom given by:  

df=n-1=100-1=99  

Since is a one-side upper test the p value would be:      

p_v =P(t_{99}>8.974)=9.43x10^{-15}  

Conclusion      

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we to reject the null hypothesis, and the actual mean is significantly higher than 20000.      

8 0
3 years ago
Light from the sun can travel a million miles in 5.368 second how many seconds is that rounded to the nearest tenth of a second
weqwewe [10]
5.4 rounded to the nearest tenth of a second
3 0
3 years ago
Read 2 more answers
Plzzz helppppppp meee
yulyashka [42]

Answer:

-3

Step-by-step explanation:

H = -3

J = -1

J = -1

M=2

(-3+-1)+(-1+2)=-3

3 0
2 years ago
Read 2 more answers
This week, Sarah spent a total of 120 minutes studying. This total was 20 more
MrMuchimi

Answer:

She spent 25 minutes studying last week

Step-by-step explanation:

L = last week

120 = 4L + 20

Subtract 20 from either side

100 = 4L

Divde either side by 4

25 = L

4 0
3 years ago
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