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3 years ago

What do you do on Brainly?

2 answers:

7 0

On brainly you can ask for help on basically anything but mainly school. You get quick responses and their is a reward system for people that help you. There is also ratings for responses and challenges to keep it somewhat entertaining. Its a pretty sweet website.

Please mark brainliest I need 5 more to rankup.

belka [17]3 years ago

4 0

On Brainly, you ask questions associated with either homework, things your learning in class or questions you have in any of the categories listed. You also want to help others by answering their problems.

You might be interested in

A store has 3 shelves of puzzles. Each shelf has 8 puzzles on it.

madreJ [45]

24 puzzles in all.

Hope this helps:)

7 0

3 years ago

Read 2 more answers

Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and

inn [45]

Complete Question

Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture. However, their nondegradable nature has prompted development of environmentally friendly composites using natural materials. An article reported that for a sample of 10 specimens with 2% fiber content, the sample mean tensile strength (MPa) was 51.1 and the sample standard deviation was 1.2. Suppose the true average strength for 0% fibers (pure cellulose) is known to be 48 MPa. Does the data provide compelling evidence for concluding that true average strength for the WSF/cellulose composite exceeds this value? (Use α = 0.05.)

t=8.169

P-value= ?

Answer:

a) $P-value=0$

b) Hence,We FAil to reject the alternative hypothesis and accept that the true average strength for the WSF/ cellulose composite exceeds 48 MPa.

Step-by-step explanation:

From the question we are told that:

Sample size $n=10$

Mean $\=x= 51.3$

Standard deviation $\sigma=1.2$

Significance level is taken as $\alpha=0.05$

t test statistics

$t=8.169$

Therefore

$P-Value=P(t>8.169)$

Critical point

$t_{\alpha,df}$

$\alpha=0.05$

$df=10-1=>9$

Therefore

P-value from T distribution table

$P-value=0$

Conclusion

$P-value (0)< \alpha(0.05)$

We Reject the Null Hypothesis $H_0$

Hence,We FAil to reject the alternative hypothesis and accept that the true average strength for the WSF/ cellulose composite exceeds 48 MPa.

7 0

3 years ago

In complete sentences, explain the following:<br> What could happen if you don't stick to a budget?

ArbitrLikvidat [17]

Answer:

A lot of things would happen. First, you would buy things that you may not need, thus wasting some of your money. If that happens often, you may slowly become broke. Another thing that could happen is you could get into debt, because you aren't keeping track of how much you spent, therefore, you would spend more and there are also things such as interest and taxes that would make you get into dept. Because of all of this happening, you would get a lot of stress as well, and you might get ill because of it.

Hope this helped!!! :D

7 0

4 years ago

Given m = 2 and the point (-1, 7), which of the following is the point-slope form of the equation?

ANEK [815]

The point-slope form:

$y-y_1=m(x-x_1)$

We have the point (-1, 7) and the slope m = 2. Substitute:

$y-7=2(x-(-1))\\\\\boxed{y-7=2(x+1)}\to\boxed{b.}$

3 0

4 years ago

What is the arc length of a circle (in meters) with a radius of 2 meters that has an arc angle of 90°? A 2π B π C 2 D 4π

Musya8 [376]

$\bf \textit{arc's length}\\\\
s=\cfrac{\theta \pi r}{180}~~
\begin{cases}
r=radius\\
\theta =angle~in\\
\qquad de grees\\ 
------\\
r=2\\
\theta =90
\end{cases}\implies s=\cfrac{(90)\pi (2)}{180}\implies s=\pi$

7 0

4 years ago