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fgiga [73]
2 years ago
8

Solve

Mathematics
1 answer:
victus00 [196]2 years ago
3 0

Answer:

x=14 , y = 21

Step-by-step explanation:

y=x-7...............1

5x+2y=7......2

reset eqn .....2

2y=-5x+7

so; y=-x-7 ×5

2y=-5x+7 ×1

5y = -5x -35

2y = -5x +7

5y-2y = -5 + 5 -35-7

<u>3y</u> = - <u>42</u>

3 3

y = 14

sub y=14 into eqn ...........1

y = -x -7

14 = - x -7

14 +7 = - x

-21 = x

x = 14 , y =-21

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Un = 5 x 21<br> What is the answer to this problem?
siniylev [52]

Answer:

N = 105/u

U = 105/n

Step-by-step explanation:

Let's solve for n.

un=(5)(21)

Step 1: Divide both sides by u.

nu/u = 105

un = 105/u

__________________________

Let's solve for u.

un=(5)(21)

Step 1: Divide both sides by n.

nu/n = 105/n

u = 105/n

4 0
3 years ago
What is the greatest common factor of 9x^2<br> 2<br> and 6x?
zheka24 [161]

Answer:

The greatest common factor is 1.

Step-by-step explanation:

In this question we will factorize the expressions given and select the common factors among all.

For 9x² = 1×3×3×X×X

For 2 = 1×2

For 6x = 1×2×3×X

So we find the common factor in all expressions is = 1

Answer is 1.

7 0
3 years ago
A random sample of 16 students selected from the student body of a large university had an average age of 25 years and a populat
eimsori [14]

Answer:

t=\frac{25-24}{\frac{2}{\sqrt{16}}}=2      

p_v =P(t_{15}>2)=0.0320  

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 reject the null hypothesis, and the true mean is significant higher than 24 years.  

Step-by-step explanation:

1) Data given and notation      

\bar X=25 represent the sample mean      

s=2 represent the standard deviation for the sample      

n=16 sample size      

\mu_o =24 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)  

Confidence =0.95 or 95%

\alpha=0.05

State the null and alternative hypotheses.      

We need to conduct a hypothesis in order to determine if the mean is higher than 24, the system of hypothesis would be:      

Null hypothesis:\mu \leq 24      

Alternative hypothesis:\mu > 24      

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{25-24}{\frac{2}{\sqrt{16}}}=2      

Calculate the P-value      

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

df=n-1=16-1=15  

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

p_v =P(t_{15}>2)=0.0320  

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 reject the null hypothesis, and the true mean is significant higher than 24 years.      

3 0
3 years ago
A cross section is the intersection of a _____ an a _____
IgorLugansk [536]
A cross section is the intersection of a solid an a plane
5 0
3 years ago
Which point satisfies the system of equations y= 3x - 2 and y=-2x + 3?
monitta

Answer:

The points which satisfy the given lines is ( 1 , 1 )  

Step-by-step explanation:

Given as :

The equation of lines is

y = 3 x - 2         ........    1  And

y = - 2 x + 3      ........ 2

From equation given

3 x - 2 = - 2 x + 3

Or , 3 x + 2 x = 3 +2

Or,   5 x = 5

So ,     x = \frac{5}{5} = 1

Put the value of x in eq 1

So, y = 3 ( 1 ) - 2

Or, y = 3 - 2 = 1

∴,  the points ( x , y ) = ( 1 , 1 )

Hence The points which satisfy the given lines is ( 1 , 1 )  Answer

5 0
3 years ago
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