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IrinaK [193]
3 years ago
10

What is the product?

Mathematics
2 answers:
Eddi Din [679]3 years ago
6 0

Answer:

\boxed{2 {x}^{2}  - 8x}

Step-by-step explanation:

2x(x - 4) = (2x \times x) - (2x  \times 4) \\  \\  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: = 2 {x}^{2}  - 8x

Gnom [1K]3 years ago
3 0

Answer:

D

Step-by-step explanation:

E2020

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What is the area of a rectangle with a width of 12 feet and length of 10 inches
kherson [118]
A = L*W = 10 * 12 = 120 square feet.
4 0
4 years ago
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach
nlexa [21]

Answer:

A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be 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.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that \mu = 130, \sigma = 30

What score is necessary to reach the 75th percentile?

This is X when Z has a pvalue of 0.75, so X when Z = 0.675.

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

0.675 = \frac{X - 130}{30}

X - 130 = 0.675*30

X = 150.25

A score of 150.25 is necessary to reach the 75th percentile.

7 0
3 years ago
3x+y=W<br><br><br><br> Solve for X....
Andre45 [30]

Answer:

x = (W - y)/3

Step-by-step explanation:

3x+y=W

3x = W - y

x = (W - y)/3

6 0
4 years ago
Solve the simultaneous equations. <br> Please help
gavmur [86]

Answer:

x=1/2, y=4

Step-by-step explanation:

Double both sides of the top equation:

4x+6y=26

Now subtract boths sides of the second one from the first one:

(4x+6y) - (4x-y) = 26 - (-2)

7y = 28

so y = 4

4x-y=-2 so 4x-4=-2

4x=2

x=1/2

4 0
3 years ago
Which property is used in the problem below?
Natali [406]

Answer:

Distributive Property

Step-by-step explanation:

2(x+4) = 2x + 8

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

2x + 8 = 2x + 8

Henceforth, distributive property

7 0
2 years ago
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