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3 years ago

Will pick brainlyest help me plz 15 pts

Mathematics

1 answer:

leonid [27]3 years ago

8 0

1.50c + 2.50a = 1100
c + a = 500

multiply the second equation by -1.50

1.50c + 2.50a = 1100
-1.50c - 1.50a = -7.50

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Simplify the expression: 4a - 3(4 - a)

Lorico [155]

Answer:

Step-by-step explanation:

$4a-3\left(4-a\right)\\\\\mathrm{Expand}\:-3\left(4-a\right):\quad -12+3a\\\\=4a-12+3a\\\\\mathrm{Simplify}\:4a-12+3a:\quad 7a-12\\\\\mathrm{Simplify}\:4a-12+3a:\quad 7a-12\\\\=7a-12$

6 0

3 years ago

Which expression is a difference of squares with a factor of 5x − 8?

Olegator [25]

Answer:

$25x^2-64$

Step-by-step explanation:

Remember that the formula for the difference of squares is $a^2-b^2=(a+b)(a-b)$ . The formula implies that if (5x - 8) is a factor, then (5x + 8) is the other factor. We can use our formula to find which one is our difference of squares:

$(5x-8)(5x+8)=(5x)^2-8^2$

$(5x-8)(5x+8)=5^2x^2-64$

$(5x-8)(5x+8)=25x^2-64$

We can conclude that the correct answer is $25x^2-64$ .

4 0

2 years ago

Do the points of the following quadrilateral create a square? A(3,4) B(-3,4)

prohojiy [21]

Answer:

Yes

Step-by-step explanation:

You can refer to the photo that I attached.

4 0

2 years ago

Due to normality, the formula for computing z is the same for a single data value, as it is

katrin2010 [14]

Using the <u>Central Limit Theorem</u>, the statement is false, as for the averages of the data values for a sample group, the standard error is $s = \frac{\sigma}{\sqrt{n}}$ , hence, the formula is:

$Z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

While for a single value, it is:

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

In a normal distribution with mean and standard deviation , the z-score of a measure X is given by:

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

It 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, which is the percentile of X.
By the Central Limit Theorem, the sampling distribution of sample means of size n has standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

Hence, the formulas are different, and for an average of the data values for a sample group it is:

$Z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

A similar problem is given at brainly.com/question/24663213

8 0

2 years ago

The scores listed below are the results from students taking a dexterity test. What is the 75th percentile of these scores? 1, 1

boyakko [2]

The answer is B 2.25

7 0

3 years ago

Read 2 more answers