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3 years ago

Plz help 4th grade review

Mathematics

2 answers:

avanturin [10]3 years ago

8 0

The answer is five you divide 445 by 89 and you get 5. The answer is c

Soloha48 [4]3 years ago

5 0

C:5

just divide 445 by 89 and you get 5

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HELLPP PLEASE :) THIS IS HARD BRAINLIEST!

lorasvet [3.4K]

Answer:

1).B

2).A

3).D

4).B

5).C

6).D

7).D

8).B

9).C

10). I believe it is A

Step-by-step explanation:

I'm sorry, i do not know how to explain this, I hope I helped you in some way and I hope these answers work for you :)

7 0

2 years ago

Solve for x and y 4x, 15 X + 12, 3y<br>(it's for a parallelogram)

yan [13]

Answer:

done on peace of paper

Step-by-step explanation: bro this was so easy how do you not know this

7 0

2 years ago

Help with this asap!

zmey [24]

Answer:

26?

Step-by-step explanation

because they are vertical? (i think the word) they are equal so set them equal to each other then solve for x

5 0

3 years ago

Consider the following hypothesis test: H0: LaTeX: \mu_1-\mu_2=0μ 1 − μ 2 = 0 Ha: LaTeX: \mu_1-\mu_2\ne0μ 1 − μ 2 ≠ 0 The follow

Pavel [41]

Answer:

$z=\frac{104-\bar 106}{\sqrt{\frac{8.4^2}{80}+\frac{7.6^2}{70}}}}=-1.53$

Step-by-step explanation:

Data given and notation

$\bar X_{1}=104$ represent the mean for the sample 1

$\bar X_{2}=106$ represent the mean for the sample 2

$\sigma_{1} =8.4$ represent the population standard deviation for the sample 1

$\sigma_{2}=7.6$ represent the population standard deviation for the sample 2

$n_{1}=80$ sample size for the group 1

$n_{2}=70$ sample size for the group 2

z would represent the statistic (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to check if the means for the two groups are the same, the system of hypothesis would be:

H0: $\mu_{1}-\mu_{2} =0$

H1: $\mu_{1} -\mu_{2} \neq 0$

If we analyze the size for the samples both are greater than 30 and we know the population deviations so for this case is better apply a z test to compare means, and the statistic is given by:

$z=\frac{\bar X_{1}-\bar X_{2}}{\sqrt{\frac{\sigma^2_{1}}{n_{1}}+\frac{\sigma^2_{2}}{n_{2}}}}$ (1)

z-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.

Calculate the statistic

First we need to calculate the mean and deviation for each sample, after apply the formulas (2) and (3) we got the following results:

And with this we can replace in formula (1) like this:

$z=\frac{104-\bar 106}{\sqrt{\frac{8.4^2}{80}+\frac{7.6^2}{70}}}}=-1.53$

7 0

2 years ago

The sum of two consecutive numbers is 71. Find the smallest number in the list

bazaltina [42]

35+36=71
35 is the answer

5 0

3 years ago