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3 years ago

8 times the difference of a number and 3 is equal to the number increased by 25. what is the number?

Mathematics

1 answer:

madam [21]3 years ago

3 0

Answer:

the answer is four

The solution is in the picture above please mark me brainliest :)

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Which function in Excel is used to perform a test of independence? a. T.TEST b. CHISQ.TEST c. NORM.S.DIST d. Z.TEST

denis23 [38]

Answer:

b. CHISQ.TEST

Step-by-step explanation:

Notation and previous concepts

A chi-square test is "used to test if the variance of a population is equal to a specified value. This test can be either a two-sided test or a one-sided test. The two-sided version tests against the alternative that the true variance is either less than or greater than the specified value"

The statistic is given by:

$\chi^2 = \sum_{i=1}^n \frac{(O_i-E_i)^2}{E_i}$

In order to calculate the p value we need to have in count the degrees of freedom , on this case $df=(rows-1)(#cols-1)$ . And we can calculate the p value would be given by:

$p_v =P(\chi^2 >\chi^2_{calc})$

But the correct comand is given by:

b. CHISQ.TEST(Actual range, Expected range)

We just need to put in one column the Observed values and in other the expectec values.

3 0

3 years ago

Solve the system by substitution -x - y - z= -8 -4x + 4y + 5z = 7 2x + 2z = 4

Stella [2.4K]

First:

2x + 2z = 4

2(x+z)=4

x+z=4/2

x=2-z

-x - y - z= -8

-(2-z)-y-z= -8 replace x

-2+z-y-z= -8 (cancel z)

-2-y= -8

6 = y

Then:

-4x + 4y + 5z = 7 replace x and y

-4(2-z)+4*6 + 5z = 7

-8 + 4z + 24 + 5z = 7

16 + 9z = 7

9z = 7 - 16

9z = -9

z = -9/9

z= -1

Finally

x= 2-z replace z

x = 2- (-1)

x = 3

5 0

3 years ago

A dart is thrown at the board shown. It hits the board at a random point. Find the probability that it will land in the unshaded

Anvisha [2.4K]

A circle is 1 revolution or 360 degrees. So, the probability that a dart will land in the unshaded region is

 $P=\frac{240}{360}=67\%$

The answer is 67%.

4 0

3 years ago

Read 2 more answers

Please help this is due ❗️❗️❗️❗️❗️

aleksandr82 [10.1K]

Answer:

Step-by-step explanation:

$19x^2y-4xy^2+5xy^2-16x^2y=\\3x^2y+xy^2=\\xy*(3x+y)$