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3 years ago

I have no idea what im doing lol pleasee help

Mathematics

1 answer:

Harman [31]3 years ago

8 0

Answer:

Your answer would be 254.47

Step-by-step explanation:

Here, you can use this formula A=πr2

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Solve the following system of equations by graphing. 3x - 2y = -6 - 3x - y = -12

MA_775_DIABLO [31]

9514 1404 393

Answer:

(x, y) = (2, 6)

Step-by-step explanation:

See the attachment for the graph.

4 0

3 years ago

A survey conducted in July 2015 asked a random sample of American adults whether they had ever used online dating (either an onl

Natasha2012 [34]

Answer:

The 99% confidence interval is (0.0787, 0.1613).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence interval 1-\alpha, we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

Z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

The survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating. This means that $n = 411, \pi = \frac{50}{411} = 0.12$

The 99% confidence interval is

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 - 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.0787$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 + 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.1613$

The 99% confidence interval is (0.0787, 0.1613).

3 0

4 years ago

Two families are sharing the cost of vacation home for one week. The cost to rent the home is $3,513 plus a $351.30 deposit. Wha

Natali [406]

The answer is $1932.15

3,513+351.30=3864.30

3864.30÷2=1932.15

Hope this helps!

6 0

4 years ago

Read 2 more answers

HELP please urgent!! - PLEASE CLICK, NEED HELP -

Makovka662 [10]

Answer:

$y=3x^2-12x-135$

Step-by-step explanation:

The standard form of a quadratic is $y=ax^2+bx+c$

We will use the x and y values from each of our 3 points to find a, b, and c. Filling in the x and y values from each point:

First point (-5, 0):

$0=a(-5)^2+b(-5)+c$ and

0 = 25a - 5b + c

Second point (9, 0):

$0=a(9)^2+b(9)+c$ and

0 = 81a + 9b + c

Third point (8, -39):

$-39=a(8)^2+b(8)+c$ and

-39 = 64a + 8b + c

Use the elimination method of solving systems on the first 2 equations to eliminate the c. Multiply the first equation by -1 to get:

-25a + 5b - c = 0

81a + 9b + c = 0

When the c's cancel out you're left with

56a + 14b = 0

Now use the second and third equations and elimination to get rid of the c's. Multiply the second equation by -1 to get:

-81a - 9b - c = 0

64a + 8b + c = -39

When the c's cancel out you're left with

-17a - 1b = -39

Between those 2 bolded equations, eliminate the b's. Do this by multiplying the second of the 2 by 14 to get:

56a + 14b = 0

-238a - 14b = -546

When the b's cancel out you're left with

-182a = -546 and

a = 3

Use this value of a to back substitute to find b:

56a + 14b = 0 so 56(3) + 14b = 0 gives you

168 + 14b = 0 and 14b = -168 so

b = -12

Now back sub in a and b to find c:

0 = 25a - 5b + c gives you

0 = 75+ 60 + c so

0 = 135 + c and

c = -135

Put that all together into the standard form equation to get

$y=3x^2-12x-135$

6 0

4 years ago

Read 2 more answers

Help a crackhead out

Natasha2012 [34]

T=5w

T= total cost
W= weeks

It can't be W= because the question is asking for total cost in dollars, so two options are cancelled out.

Can't be t=5+w because it's 5 per week and if, let's say calculating dollars for 2 weeks, the answer would be t=5+2=7 and that wouldn't be right

4 0

3 years ago

Read 2 more answers