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3 years ago

I don’t get this...!!!

Mathematics

1 answer:

notka56 [123]3 years ago

3 0

Ray CB, because it will include point A in the ray
Rays go on forever in one direction, so Ray CB and Ray CA are the same because they're going in the same direction

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Simplify the following expression.<br> <br> 15p+15p+25p =

IrinaK [193]

15p+15p+25p=30p+25p=55p

3 0

3 years ago

Which operation is used for the equation down below

mario62 [17]

Answer:

Step-by-step explanation:

2x+8=9

you want to isolate the variable so you subract 8 from both sides

2x=1

now you want x by itself so you divide by 2 on both sides

x=1/2 or x=0.5

Hope this helped :)

3 0

3 years ago

An educational psychologist wishes to know the mean number of words a third grader can read per minute.

Rama09 [41]

Answer: 208.

Step-by-step explanation:

The formula to find the minimum sample size is given by :-

$n= (\dfrac{z^*\times \sigma}{E})^2$ (1)

, where z* = critical z-value (two tailed).

$\sigma$ = Standard deviation ( from prior study ) and E = Margin of error.

As per given , we have

Margin of error : E= 0.29

Confidence level = 85%

Significance level = $\alpha=1-0.85=0.15$

Using z-table , the critical value (two -tailed)= $z^*=z_{\alpha/2}=z_{0.15/2}=z_{0.075}=1.439$

As per previous study , Variance = $\sigma^2=8.41$

$\sigma=\sqrt{8.41}=2.9$

Now, the required minimum sample size = $n= (\dfrac{(1.439)\times (2.9)}{0.29})^2$ [Substitute the values in formula (1)]

$n=(14.39)^2$

$n=207.0721\approx208$ [ Round to the next integer]

Hence, the minimum number of third graders that must be included in a sample = 208.

5 0

3 years ago

Help number 5 15 pointsss

r-ruslan [8.4K]

Answer:

x=101

Step-by-step explanation:

8 0

3 years ago

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A recipe uses 1/3 cup of brown sugar to make 18 cookies. How many cups of brown sugar are needed to make 45 cookies?

Alenkinab [10]

Answer:

5/6 cups of sugar

Step-by-step explanation:

45 divided by 18 = 2.5

1/3 x 2.5 = 0.83

0.83 = 5/6 cups

3 0

3 years ago

Read 2 more answers