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3 years ago

6

Which value must be added to the expression x2 + 12x to make it a perfect-square trinomial?

1 answer:

Maksim231197 [3]3 years ago

3 0

+ 36 is ur Answer

ONLY NAKED GIRLS

ID => 657 824 8085

PA => 12345

[ONLY - GIRLS]

On ZO.OM App

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2 years ago

How do you factor: 5x^3+30x^2+45x (please show steps)

Natasha2012 [34]

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3 years ago

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Aidan bought a jacket on sale for $38.40. If the original price of the jacket was $64, what was the percent of the discount?

UkoKoshka [18]

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3 years ago

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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)

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3 years ago