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marishachu [46]
3 years ago
10

Question 2: If x = -5, what is the value of x^2+1 ______ -1 ? x^2

Mathematics
1 answer:
Eva8 [605]3 years ago
7 0

Answer:

The value of the expression is = \frac{1}{25}

Step-by-step explanation:

The expression whose value is to be found is \frac{ {x}^{2} + 1 }{ {x}^{2} }- 1

Also from the question, x=-5

Hence to find the value for the expression, we put x=-5 and simplify.

This implies that,

\frac{ { (- 5)}^{2} + 1 }{ {( - 5)}^{2} }- 1

= \frac{25+ 1 }{25}- 1

=  \frac{26}{25} - 1

= \frac{26}{25} - \frac{25}{25}

= \frac{1}{25}

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An English professor assigns letter grades on a test according to the following scheme. A: Top 15% of scores B: Scores below the
lisabon 2012 [21]

Answer:

59 to 66

Step-by-step explanation:

Mean test scores = u = 74.2

Standard Deviation = \sigma = 9.6

According to the given data, following is the range of grades:

Grade A: 85% to 100%

Grade B: 55% to 85%

Grade C: 19% to 55%

Grade D: 6% to 19%

Grade F: 0% to 6%

So, the grade D will be given to the students from 6% to 19% scores. We can convert these percentages to numerical limits using the z scores. First we need to to identify the corresponding z scores of these limits.

6% to 19% in decimal form would be 0.06 to 0.19. Corresponding z score for  0.06 is -1.56 and that for 0.19 is -0.88 (From the z table)

The formula for z score is:

z=\frac{x-u}{\sigma}

For z = -1.56, we get:

-1.56=\frac{x-74.2}{9.6}\\\\ x = 59

For z = -0.88, we get:

-0.88=\frac{x-74.2}{9.6}\\\\ x = 66

Therefore, a numerical limits for a D grade would be from 59 to 66 (rounded to nearest whole numbers)

7 0
3 years ago
ASAP, GEOMETRY PLEASE HELP ME
Black_prince [1.1K]

Answer: 405 yd squared

Step-by-step explanation:

V = (bh)/2

b = (15 x 9)/2 = 67.5

67.5 x 12 = 810

810/ 2 = 405

3 0
2 years ago
If x+2=5 then x= What
alexandr402 [8]

Answer:

3

Step-by-step explanation:

5-2=3

Just do it the other way to find the answer!

I hope this helps!

3 0
3 years ago
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1. Each side of a square barn is 9 meters long.
oksian1 [2.3K]

Answer:

The area and the perimeter of the square barn which has each side 9 meters long is 81 m² and 36 m.

Step-by-step explanation:

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2 years ago
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How do u write 5(2x - 1) in a distributive property
Nookie1986 [14]

Answer:

5(2x-1) = 5(2x) - 5(1)

Step-by-step explanation:

The distributive property states that multiplying a sum or difference of two terms by a number is equal to multiplying the same number with each term of the sum or difference separately and then adding the products.

It can be written as:

a(b+c) = ab + ac

or

a(b-c) = ab - ac

So, for the given question,

=>5(2x-1) = 5(2x) - 5(1)

5 0
3 years ago
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