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o-na [289]
3 years ago
14

Y = x2 - 3x -18 Solve for x.

Mathematics
1 answer:
alisha [4.7K]3 years ago
4 0
Thus is the correct answer

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The combined math and verbal scores for females taking the SAT-I test are normally distributed with a mean of 900 and a standard
Genrish500 [490]

Answer:

50% of females do not satisfy that requirement

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 900, \sigma = 200

If a college includes a minimum score of 900 among its requirements, what percentage of females do not satisfy that requirement

This is scores lower than 900, which is the pvalue of Z when X = 900.

So

Z = \frac{X - \mu}{\sigma}

Z = \frac{900 - 900}{200}

Z = 0

Z = 0 has a pvalue of 0.5

50% of females do not satisfy that requirement

7 0
3 years ago
LaShawn solved the equation below to the determine the solution.
alexira [117]

Answer:

x = all real numbers.

Step-by-step explanation:

3 x minus 8 = negative x + 4 (x minus 2)

3x - 8 = -x + 4(x - 2)

3x - 8 = -x + 4x - 8

3x - 8 = 3x - 8

3x - 3x = -8 + 8

0 = 0

Since the result is a true statement, but 0 = 0, x is equivalent to all real numbers.

Hope this helps!

5 0
3 years ago
Read 2 more answers
If anyone can help with either one that’d be great
Volgvan

4.  Solve

1430 = 0.55t^2 + 550

1430 - 550 =880 = 0.55t^2

880/0.55 = 1600 = t^2

t= \pm \sqrt{1600} = \pm 40

On the positive answer makes sense.

Answer: Month 40

5. The throw ends when the height is zero (I guess we're ignoring rolling).

0 = -0.02x^2 + x + 6

x = \dfrac{-1 \pm \sqrt{1^2 - 4(6)(-0.02)}}{2(-0.02)}

Only the negative sign for the plus/minus will give a sensible, positive answer:

x = \dfrac{-1 - \sqrt{1^2 - 4(6)(-0.02)}}{2(-0.02)} = 55.4138

Answer: 55.4 feet

6 0
4 years ago
How to round 649,418 tens
miskamm [114]

Answer:

What are you asking?

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
a roll of netting measures r metres.ryan bought 1/4 of a roll and trimmed 2 metres of the netting.he had 5 meters of netting lef
jeka94

Answer:

28 m

Step-by-step explanation:

full roll length: r

Ryan bought: r/4

He trimmed 2 m: r/4 - 2

Length left: 5

r/4 - 2 = 5

r/4 = 7

r = 28

Answer: 28 m

8 0
2 years ago
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