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3 years ago

¿ sᴉɥʇ ǝʌlos ǝuoǝɯos uɐɔ

Mathematics

2 answers:

Korolek [52]3 years ago

8 0

Answer:

Step-by-step explanation:

interweb it, because I am not that brainy big brains

valentinak56 [21]3 years ago

7 0

Answer:

<h2 /><h2>yr ans is 0</h2><h3>Because</h3><h3>2-2=0</h3><h3>nd whenever 0 comes in multiplication the value becomes 0</h3>

Step-by-step explanation:

HOPE IT HELP

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Please help me 16226.25 ÷ 60=

cestrela7 [59]

The equation stated gives the answer of 270.4375

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3 years ago

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if there are 15 puppies 12 kittens and 6 rabbits in a pet store than what animals are in a 5 to 2 ratio

IrinaK [193]

Puppies and kittens.

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4 years ago

F(x) = x-5, g(x) =x^2 - 1 find (f+g)

DaniilM [7]

F(x)=x-5
g(x)=x^2
Now adding f(x) and g(x)
x-5+x^2-1
x^2+x-6
x^2+(3-2)x-6
x^2+3x-2x-6
x(x+3)-2(x+3)
(x-2)(x+3) answer

5 0

3 years ago

Brainliest and 15 points

Lorico [155]

Answer:

Step 2 has error and step 4 has error.

Step-by-step explanation:

Here we can see that elimination method is applied to solve the system of equations for which -2 is multiplied both sides of equation first

-2(x+2y)=-2(10 which is correct

but in step 2

left side is -2x-4y and the right side is -10 which has to be -20 which makes this step wrong and this is the error made by student.

in Step 4 also ,value of the y has to be 5 but student plugged y =1 which is also error by student.

Correct solution is

-2x-4y= -20

2x+ 5y= 15

on adding ,we get

y = -5

plugging y =5 in equation x+2y= 10 ,we get x+2(-5) =10 ,we get x = 20

therefore (20,-5) is the solution

4 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

3 0

3 years ago