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3 years ago

A point at (-5,7) in the standard (x,y) coordinate

1 answer:

dsp733 years ago

7 0

The correct answer is actually (2,2)

What you do is you add 7 to the x coordinate since it is 7 to the right, -5+7=2 so the new x coordinate is 2

Then you subtract 5 from the y coordinate since it is 5 down, 7-5=2 so the new y coordinate is 2

So the answer is (2,2)

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You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you beli

zhuklara [117]

Answer:

We need to sample at least 1069 parents.

Step-by-step explanation:

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

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

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.

How many parents do you have to sample?

We need to sample at least n parents.

n is found when $M = 4, \sigma = 79.5$ . So

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

$4 = 1.645*\frac{79.5}{\sqrt{n}}$

$4\sqrt{n} = 1.645*79.5$

$\sqrt{n} = \frac{1.645*79.5}{4}$

$(\sqrt{n})^{2} = (\frac{1.645*79.5}{4})^{2}$

$n = 1068.92$

Rounding up

We need to sample at least 1069 parents.

6 0

3 years ago

Read 2 more answers

In March, you have $220 in your savings account. By the end of April, your savings have increased by 30%. How much money do you

Lana71 [14]

Answer:

$286

Step-by-step explanation:

220:100=2.2

2.2 x 30 = 66

220+66=286

6 0

3 years ago

Plzzzzzzzzzzzzzzzzzzzzz help show your work <br><br><br> - 9/2+-8/13

S_A_V [24]

Answer:

-133/26

Step-by-step explanation:

-9/2 + -8/13

First find a common domintor.

26 will be a common domintor.

2 × 13=26 so multiply -9 by 13= -117

13×2=26 so multiply -8 by 2= -16

-117/26 + -16/26 = -133/26

3 0

2 years ago

Read 2 more answers

A circular pillar candle is 2.8 inches wide and 6 inches tall. What are the lateral area and surface area of the candle ?

Alexeev081 [22]

Answer should be 36.95 if 1.4 is the radius

4 0

2 years ago

Trevor has already baked 11 pies, and he can bake 1 pie with each additional cup of sugar he buys.with 34 additional cup of suga

murzikaleks [220]

Answer:

Step-by-step explanation:

he already baked 11 pies and it says that he can bake 1 pie with an additional cup of sugar so 1 cup of suger equals 1 pie wich means that he can make 34 pies with the additionnal cups of sugar and he already baked 11 and 11 + 34 = 45.

8 0

3 years ago