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Bas_tet [7]
2 years ago
15

5 If 15 cookies cost $8.50, how much would it cost for 25 cookies? Write a proportion and solve it below:​

Mathematics
1 answer:
AlladinOne [14]2 years ago
6 0

Answer:

14.25

Step-by-step explanation:

8.5/15=0.57

1:0.57

0.57*25=14.25

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Step-by-step explanation:

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3 0
2 years ago
Many states assess the skills of their students in various grades. One program that is available for this purpose is the Nationa
Nataly [62]

Answer:

A score of 314 is needed to be in the top 25% of students who take this exam.

Step-by-step explanation:

We are given that one of the tests provided by the NAEP assesses the reading skills of twelfth-grade students. In recent years, the national mean score was 289 and the standard deviation was 37.

Let X = <u><em>scores of the tests provided by the NAEP</em></u>

The z-score probability distribution for the normal distribution is given by;

                           Z  =  \frac{X-\mu}{\sigma}  ~ N(0,1)

where, \mu = national mean score = 289

           \sigma = standard deviation = 37

Now, we have to find how high a score is needed to be in the top 25% of students who take this exam, that means;

            P(X > x) = 0.25     {where x is the required score}

            P( \frac{X-\mu}{\sigma} > \frac{x-289}{37} ) = 0.25

            P(Z > \frac{x-289}{37} ) = 0.25

In the z table, the critial value of z that represents the top 25% of the area is given as 0.6745, that is;

                        \frac{x-289}{37}=0.6745

                        {x-289}=0.6745\times 37

                        x = 289 + 24.96 = 313.96 ≈ 314

Hence, a score of 314 is needed to be in the top 25% of students who take this exam.

7 0
3 years ago
16 2/3% of 21.6 is?
soldier1979 [14.2K]

Answer:

21

Step-by-step explanation:

7 0
3 years ago
A three‐digit number satisfies the following conditions: The digits are consecutive whole numbers in increasing order; the sum o
IRINA_888 [86]
Answer: 123
They have to add up to 3 4 5 6 or 7 so it has to be that
4 0
3 years ago
Find the measure of each angle indicated.<br> 7)<br> 920<br> A) 118°<br> B) 92°<br> C) 96°
Rus_ich [418]

Answer:

Its 92 degrees because they are equal. I hope this helped! plz make me brainliest

Step-by-step explanation:

5 0
3 years ago
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