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2 years ago

Can some one multiply (x+11)^2

Mathematics

1 answer:

Rama09 [41]2 years ago

6 0

Answer:

x^2 + 22x + 121

Explanation:

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Find the equation of the line that goes through the points (3,8) and (9,16).

Aneli [31]

Answer:

4x-3y+12=0 is required eqn

Step-by-step explanation:

Let, 3,8 be x1,y1

9,16 be x2,y2

Now,

Eqn of st.line is y-y1 = y2-y2/x2-x1 * (x-x1)

y-8 = 16-8/9-3 * (x-3)

y-8 = 4/3*(x-3)

3y-24 = 4x-12

4x-3y+12=0 is required eqn

3 0

3 years ago

SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is inter

Rama09 [41]

Answer:

The administrator should sample 968 students.

Step-by-step explanation:

We have to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.88}{2} = 0.06$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a p-value of $1 - 0.06 = 0.94$ , so Z = 1.555.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Standard deviation of 300.

This means that $n = 300$

If the administrator would like to limit the margin of error of the 88% confidence interval to 15 points, how many students should the administrator sample?

This is n for which M = 15. So

$M = z\frac{\sigma}{\sqrt{n}}$

$15 = 1.555\frac{300}{\sqrt{n}}$

$15\sqrt{n} = 300*1.555$

Dividing both sides by 15

$\sqrt{n} = 20*1.555$

$(\sqrt{n})^2 = (20*1.555)^2$

$n = 967.2$

Rounding up:

The administrator should sample 968 students.

5 0

2 years ago

The bottom of a swimming pool is 10 feet below the surface of the water in the pool. The surface of the water is represented by

iVinArrow [24]

Answer:

I think its +10 above surface

4 0

3 years ago

Read 2 more answers

Let two cards be dealt successively, without replacement, from a standard 52-card deck Find probability of the event hear dealt

Marianna [84]

Answer:

12/51

Step-by-step explanation:

There are 13 cards for each shape in a 52-card deck

If the first card is a heart, that means the probability is 13/52 = 1/4

If the second card is a heart, that means the probability is 12/51.

6 0

3 years ago

Which set of ordered pairs does not represent a function?

Lunna [17]

Answer:

Step-by-step explanation:

(0, 0) (0, 1) (1, 2) (1, 3)

For it to be a function each x value should have one y value.

There are two 0's for x and two 1's for x. This is how you can tell it's not a function.

7 0

2 years ago

Read 2 more answers