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2 years ago

PLEASE HELP ME !! i’ll mark brainliest if you’re correct

Mathematics

2 answers:

exis [7]2 years ago

8 0

analyze problem

no need for distance formula

same x, only need to subtract y

3a-0=3a

Zolol [24]2 years ago

4 0

Answer:

Step-by-step explanation:

As the figure is a square, any given side will be parallel to the one that is opposite to it. Side CB is parallel to side AD, which extends from the origin point (0,0) to 3a. Given this fact, we can assume that AD has a length of 3a, and since all sides of a square are of the same length, we can assume the same length for side CB.

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B4.1a) The diagram shows a triangle.

Yuki888 [10]

So angles on a straight line add up to 180°
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3 years ago

A box contains 146 marbles which are either red or blue. there are 28 more blue marbles than red marbles. how many blue marbles

rusak2 [61]

R + b = 146. Supposing that b=r+28,

r + (r+28) = 146, or 2r + 28 = 146.

Simplifying: 2r = 118. Then r = 59, and b = r+28 = 59+28 = 87 blue marbles

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3 years ago

Factorise <br> x2 + 10x + 16

d1i1m1o1n [39]

Answer:

hope this helps, (x+2) (x+8)

Step-by-step explanation:

factor x^2 + 10x+16 using the AC Method

6 0

3 years ago

Read 2 more answers

Trisha knit a total of 8 centimeters of scarf over 4 nights. How many nights will Trisha have to spend knitting in order to knit

Gnom [1K]

Answer: 6

Step-by-step explanation:

You would divide the number by the other number to get the awnser

6 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

Brums [2.3K]

Answer:

$t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349$

$p_v =P(t_9>10.349)=1.34x10^{-6}$

If we compare the p value and the significance level given for example $\alpha=0.05$ we see that $p_v$ so we can conclude that we reject the null hypothesis, and the the actual mean is significantly higher than 48 MPa at 5% of significance.

Step-by-step explanation:

1) Data given and notation

$\bar X=51.6$ represent the sample mean

$s=1.1$ represent the standard deviation for the sample

$n=10$ sample size

$\mu_o =48$ represent the value that we want to test

$\alpha=0.05$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to determine if the mean score is higher than 48, the system of hypothesis would be:

Null hypothesis: $\mu \geq 48$

Alternative hypothesis: $\mu > 48$

We don't know the population deviation, so for this case is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:

$t=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349$

Calculate the P-value

First we find the degrees of freedom:

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

Since is a one-side upper test the p value would be:

$p_v =P(t_9>10.349)=1.34x10^{-6}$

Conclusion

5 0

3 years ago