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3 years ago

I need help finding x.

Mathematics

1 answer:

amid [387]3 years ago

5 0

Maybe using a protractor might help. But know that a straight angle equals 180. I don't really understand it. But use the <span>Pythagorean Theorem so a^2+B^2=c^2</span>

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Jamil traveled 210 miles, which is 70% of the total

Sergio039 [100]

Answer: The correct answer is B because 0.7x=210, x=300

Step-by-step explanation:

210= 70% of the total distance to his grandfather's house, lets take that total distance for x.

So if:

210=0.7x

x=210/0.7

x=300

7 0

3 years ago

A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups

mash [69]

Using the t-distribution, we have that the 95% confidence interval for the true mean number of pushups that can be done is (9, 21).

For this problem, we have the <u>standard deviation for the sample</u>, thus, the t-distribution is used.

The sample mean is of 15, thus $\overline{x} = 15$ .
The sample standard deviation is of 9, thus $s = 9$ .
The sample size is of 10, thus $n = 10$ .

First, we find the number of degrees of freedom, which is the one less than the sample size, thus df = 9.

Then, looking at the t-table or using a calculator, we find the critical value for a 95% confidence interval, with 9 df, thus t = 2.2622.

The margin of error is of:

$M = t\frac{s}{n}$

Then:

$M = 2.2622\frac{9}{\sqrt{10}} = 6$

The confidence interval is:

$\overline{x} \pm M$

Then

$\overline{x} - M = 15 - 6 = 9$

$\overline{x} + M = 15 + 6 = 21$

The confidence interval is (9, 21).

A similar problem is given at brainly.com/question/25157574

6 0

3 years ago

Cristina is sending out thank you cards for birthday presents. She has pink (P), blue (B), and green (G) cards, and white (W) an

Brut [27]

Answer:

PW, BW, GW, PY, BY, GY

Step-by-step explanation:

We need to determine the sample space

pink(P), blue (B), and green (G) cards, (W) and yellow (Y) envelopes

Each color card can match with each color envelope

Start with the white envelopes and each color card

and then the yellow envelopes with each color card

PW BW GW

PY BY GY

3 0

3 years ago

What is the digit in the ten billions place in this number 30,242,386,651

Minchanka [31]

It’s 1 that’s in the ten billions

8 0

4 years ago

Slope line G(-3,1)H(-2,-2)

Anton [14]

The slope from point G to point H is -3/1 or -3
$m = \frac{y2 - y1}{x2 - x1}$
Plug into points into formula with the corresponding x and y variables.
(x1,y1), (x2,y2)
$m = \frac{ - 2 - 1}{ - 2 - ( - 3)}$
Solve
m=-3/1
m=3

8 0

3 years ago