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Arlecino [84]
2 years ago
15

THIS IS A SYSTEMS OF EQUATIONS QUESTION-

Mathematics
1 answer:
Whitepunk [10]2 years ago
6 0

Answer: Equation 1, sum of the numbers: x + y = 53. Equation 2, difference of the numbers: x - y = 25. System of equations: x + y = 53. x - y = 25. 2x = 78.

Step-by-step explanation:

there you go

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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
Which is the least ...0.105 0.501 0.015 0.15
sergeinik [125]
The least is 0,015

hope this will help you 
3 0
3 years ago
Read 2 more answers
Solve <br><br> 0.6(10n + 25) = 10 + 5n ?
Pachacha [2.7K]

Answer: x=-5

<u>Simplify both sides of the equation</u>

(0.6)(10n)+(0.6)(25)=10+5n(Distribute)\\6n+15=10+5n\\6n+15=5n+10

<u>Subtract 5n from both sides</u>

6n+15-5n=5n+10-5n\\n+15=10

<u>Subtract 15 from both sides</u>

n+15-15=10-15\\n=-5

5 0
3 years ago
Read 2 more answers
To add integers with the same sign
Mariana [72]

Arithmetic

-3-2=5

because

-3-2

=

-3 + -2

3 negatives + 2 negatives = 5 negatives

5 0
3 years ago
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Simplify the expression 4x+2-1/2x
oksano4ka [1.4K]

answer 41x

Step-by-step

6 0
3 years ago
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