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2 years ago

180° 25° X x= 100 POINTS PLS HELP

Mathematics

2 answers:

IgorLugansk [536]2 years ago

4 0

Answer:

x=65*

Step-by-step explanation:

theres a small rectangle near x and it means that the angle is 90*

and the upper angle is 180

180+90+25+x=360*

x=65*

lutik1710 [3]2 years ago

4 0

Answer:

∠x=65°

Step-by-step explanation:

The angles given are complementary angles ( 90°).

25°+∠x=90°

∠x=65°

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A large on-demand video streaming company is designing a large-scale survey to determine the mean amount of time corporate execu

Diano4ka-milaya [45]

Answer:

$n=(\frac{2.262(3)}{0.25})^2 =736.79 \approx 737$

So the answer for this case would be n=737 rounded up to the nearest integer

Step-by-step explanation:

We have the following info given:

$\bar X = 12$ the sample mean

$s = 3$ the sample deviation

$n = 10$ represent the sample size

The degrees of freedom are given by:

$df =n-1 =10-1=9$

The margin of error is given by this formula:

$ME=t_{\alpha/2}\frac{s}{\sqrt{n}}$ (a)

And on this case we have that ME =0.25 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{t_{\alpha/2} s}{ME})^2$ (5)

The confidence level is 95% and the critical value for this case would be given by $t_{\alpha/2}=2.262$ , replacing into formula (5) we got:

$n=(\frac{2.262(3)}{0.25})^2 =736.79 \approx 737$

So the answer for this case would be n=737 rounded up to the nearest integer

7 0

2 years ago

I picked the last one by accident but what is the correct answer?

kenny6666 [7]

The third choice because -10 is greater than -14 and greater numbers are more towards the right.

3 0

2 years ago

Read 2 more answers

I need you to help me solve this

Svet_ta [14]

For the expression to be factor-able the Discriminant , has to be greater or equal to zero
ax^2 + cx + b = 0

c^2 - 4 ab >= 0

(-3)^2 - 4 * 1 * b >= 0

9 - 4b >= 0

9 >= 4b

b <= 9/4 (2.25)

Pick any value in that range for ex:

0 , 2, -3, -6

7 0

3 years ago

Can someone please help me with this!!! B

Arte-miy333 [17]

I think the answer is 1

4 0

2 years ago

Read 2 more answers

Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. Th

denpristay [2]

Answer:

(1) Correct option is B.

(2) Correct option is C.

Step-by-step explanation:

The information provided is:

$n_{1}=200,\ \bar x_{1}=22.7,\ s_{1} = 4.5\\n_{2}=200,\ \bar x_{2}=19.7,\ s_{2} = 4.3$

The (1 - <em>α</em>)% confidence interval for the difference between two mean is:

$CI=\bar x_{1}-\bar x_{2}\pm t_{\alpha/2, (n_{1}+n_[2}-2}\sqrt{\frac{s_{1}^{2}}{n_{1}}+\frac{s_{2}^{2}}{n_{2}} }$

The critical value of <em>t</em> is:

$\alpha /2=0.05/2=0.025$

degrees of freedom $=n_{1}+n_{2}-2=200+200-2=398$

$t_{\alpha/2, n_{1}+n_{2}-2}=t_{0.025, 398}=1.96$

Compute the 95% confidence interval for the difference between two mean as follows:

$CI=22.7-19.7\pm 1.96\sqrt{\frac{4.5^{2}}{200}+\frac{4.3^{2}}{200} }\\=3\pm0.8624\\=(2.1376, 3.8624)\\\approx(2.14, 3.86)$

Thus, the 95% confidence interval, (2.14, 3.86) implies that the true mean difference value is contained in this interval with probability 0.95.

Correct option is B.

The null value of the difference between means is 0.

As the value 0 is not in the interval this implies that there is a difference between the two means, concluding that priming does have an effect on scores.

Correct option is C.

4 0

2 years ago