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2 years ago

Someone please help me

Mathematics

1 answer:

Maksim231197 [3]2 years ago

5 0

Answer:

Step-by-step explanation:

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Add.910+(−45).Write your answer as a fraction in simplest form

gavmur [86]

-44.09 i dont understand why we must have 20 characters but OK

3 0

3 years ago

A random sample of 15 employees was selected. The average age in the sample was 31 years with a variance of 49 years. Assuming a

vova2212 [387]

Answer:

Assuming ages are normally distributed, the 98% confidence interval for the population average age is [26.3, 35.7].

Step-by-step explanation:

We have to construct a 98% confidence interval for the mean.

The information we have is:

- Sample mean: 31

- Variance: 49

- Sample size: 15

- The age is normally distributed.

We know that the degrees of freedom are

$k=n-1=15-1=14$

Then, the t-value for a 98% CI is t=2.625 (according to the t-table).

The standard deviation can be estimated from the variance as:

$s=\sqrt {s^2}=\sqrt{49}=7$

The margin of error is:

$E=t_{14}*s/\sqrt{n}\\\\E=2.625*7/\sqrt{15}=18.375/3.873=4.7$

Then, the CI can be constructed as:

$M-t*s/\sqrt{n}\leq\mu\leq M+t*s/\sqrt{n}\\\\31-4.7\leq \mu \leq 31+4.7\\\\26.3\leq \mu \leq 35.7$

5 0

3 years ago

Solve for x. 8 + 6x 4*+2

zheka24 [161]

Answer:

x = 0

Step-by-step explanation:

8 + 6x = 4 * 2

If this is the equation then start with multiplying 4 by two and subtracting 8 from both sides

6x = 0

Divide 6 from both sides

x = 0

To test this, insert the value of x which is 0

8 + 6(0) = 4 * 2

Multiply 6 and 0

8 + 0 = 4 * 2

Multiply 4 and 2

8 + 0 = 8

Add

8 = 8

This equation is true as you can see so x is equal to 0.

Hope this helps.

- Que

5 0

3 years ago

Read 2 more answers

For what values of x and y must ABCD be a parallelogram?

Tamiku [17]

X = 7 and Y = 9

Because the parallel sides have to be equal and these inputs make the side equal.

3 0

2 years ago

Find the slope of the line below

charle [14.2K]

Answer:

-2

Step-by-step explanation:

$\boxed{slope = \frac{y1 - y2}{x1 - x2} }$

☆ (x₁, y₁) is the first coordinate and (x₂, y₂) is the second coordinate.

Given that the two points (-12, 10) and (-10, 6) lie on the line,

slope of the line

$= \frac{10 - 6}{ - 12 - ( - 10)}$

$= \frac{4}{ - 12 + 10}$

$= \frac{4}{ - 2}$

$= - 2$

Extra:

The line has a negative slope as looking from the left to right, the line is sloping downwards.

6 0

2 years ago