1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jeka94
3 years ago
15

(25x2) + (3x10) = ? (25x2) + (3x10) = ?

Mathematics
2 answers:
lidiya [134]3 years ago
7 0
Answer: 80
Explanation: 50+30
ki77a [65]3 years ago
6 0

Answer:

fist 1 is 80 second on is 80

You might be interested in
Consider the accompanying data on breaking load (kg/25mm width) for various fabrics in both an unabraded condition and an abrade
WITCHER [35]

Answer:

The critical value for a one-tailed test with 7 degrees of freedom and level of significance α=0.01 is tc=2.998.

The test statistic (t=1.729) is below the critical value and falls within the acceptance region, so it is failed to reject the null hypothesis.

At a significance level of 0.01, there is not enough evidence to support the claim that the true difference is significantly bigger than 0.

Step-by-step explanation:

We have a matched-pair t-test for the difference.

We have the null and alternative hypothesis written as:

H_0: \mu_d=0\\\\H_a: \mu_d>0

We have n=8 pairs of data. We calculate the difference as:

d_1=U_1-A_1=36.4-28.5=7.9

Then, with this procedure we get the sample for d:

d=[7.9,\, 35,\, 5.5,\, 4.2,\, 6.7,\, -3.7,\, -0.9,\, 3.3]

The sample mean and standard deviation are:

M=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M=\dfrac{1}{8}(7.9+35+5.5+. . .+3.3)\\\\\\M=\dfrac{58}{8}\\\\\\M=7.25\\\\\\s=\sqrt{\dfrac{1}{n-1}\sum_{i=1}^n\,(x_i-M)^2}\\\\\\s=\sqrt{\dfrac{1}{7}((7.9-7.25)^2+(35-7.25)^2+(5.5-7.25)^2+. . . +(3.3-7.25)^2)}\\\\\\s=\sqrt{\dfrac{985.08}{7}}\\\\\\s=\sqrt{140.73}=11.86\\\\\\

Now, we can perform the one-tailed hypothesis test.

The significance level is 0.01.

The sample has a size n=8.

The sample mean is M=7.25.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=11.86.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{11.86}{\sqrt{8}}=4.1931

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{7.25-0}{4.1931}=\dfrac{7.25}{4.1931}=1.729

The degrees of freedom for this sample size are:

df=n-1=8-1=7

This test is a right-tailed test, with 7 degrees of freedom and t=1.729, so the P-value for this test is calculated as (using a t-table):

\text{P-value}=P(t>1.729)=0.0637

As the P-value (0.0637) is bigger than the significance level (0.01), the effect is not significant.

The null hypothesis failed to be rejected.

At a significance level of 0.01, there is not enough evidence to support the claim that the true difference is significantly bigger than 0.

If we use the critical value approach, the critical value for a one-tailed test with 7 degrees of freedom and level of significance α=0.01 is tc=2.998. The test statistic is below the critical value and falls within the acceptance region, so it is failed to reject the null hypothesis.

8 0
3 years ago
HELP AS SOON AS POSSIBLE PLEASE : What is the distance between 7 and -1?
Alekssandra [29.7K]

Answer:

8

Step-by-step explanation:

3 0
3 years ago
Combine these radicals.<br> -6v100 + V36
olya-2409 [2.1K]

Answer:

-564v

Step-by-step explanation:

6 . 100 = 600

-600v + 36v

= -564v

pls mark brainliest

5 0
3 years ago
Read 2 more answers
Using the slope formula, find the slope of the line through the given points.
BabaBlast [244]

Answer:

-2

Step-by-step explanation:

Slope = (4-8) / (9-7) = -4/2 = -2

5 0
2 years ago
What is 1/3 + 1/2?.......
Virty [35]

Answer:

5/6

Step-by-step explanation:

1/3 + 1/2 = 5/6

3 0
3 years ago
Read 2 more answers
Other questions:
  • Tell whether the sequence is arithmetic. if it is, what is the common difference? 1, 1 1/8, 1 1/4, 1 3/8
    8·1 answer
  • (08.03)Consider the following pair of equations:
    6·1 answer
  • Please help me 2nd and third question
    12·1 answer
  • Answer the following question about the function whose derivative is given below
    6·1 answer
  • Simplify the expression. Write your answer as a power.
    12·1 answer
  • HELP PLEASE!! Math question— Please explain,,,
    9·1 answer
  • Emma buys 100384728294857283848474782384782384828 watermelons, she gave 48283848328 to her next-door neighbor. what's her auntie
    14·1 answer
  • Plsssss will mark brainliest
    10·2 answers
  • 2. Determine the prime factorization of each number. a) 95 b) 112 c) 164 d) 150​
    15·1 answer
  • 6.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!