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3 years ago

I don’t understand need help

Mathematics

2 answers:

Kipish [7]3 years ago

8 0

Answer: 14y^3 - 8y^2 - 5y + 7

Step-by-step explanation:

Simplify and then combine like terms.

Original problem: 2y^2 + 7y + 11 - 8y^2 - 5y + 7

Simplified: 14y^3 + 11 - 8y^2 - 5y + 7

And then combined: 14y^3 + 11 - 8y^2 - 5y + 7

Combined continued: 14y^3 -8y^2 -5y +11 + 7

Final: 14y^3 - 8y^2 - 5y + 7

I already excluded anything that was written as "+ -(insert number)" because it would still end up to be "-" or a subtract/negative.

I hope this helps, and that I did it right.

kodGreya [7K]3 years ago

5 0

Answer:

6y^2-12y-4

Step-by-step explanation:

(8y^2-5y+7) - (2y^2+7y+11)

(8y^2-5y+7)-2y^2-7y-11

Combine like terms:

6y^2-12y-4

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Find the slope of the line that passes through the given points (-1.6) and (8.4) Select the correct choice below and, if necessa

fiasKO [112]

Answer:

The slope is $m=-\frac{2}{9}$

Step-by-step explanation:

we know that

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

we have

$A(-1,6)\ B(8,4)$

Substitute the values

$m=\frac{4-6}{8+1}$

$m=\frac{-2}{9}$

$m=-\frac{2}{9}$

6 0

3 years ago

A city has a population of 250,000 people. Suppose that each year the population grows by 6%. What will the population be after

irinina [24]

Answer:

503,049

Step-by-step explanation:

250,000 × 1.06^12 is the formula.

You take the percentage which is 6% and you add 1 to it.

So, you get 1.06

Then you take the 1.06 and raise it to the number of years which is 12.

1.06^12

Then you multiply that number to the base number which is 250,000 and get 503,049.

Hope this helps!

5 0

3 years ago

Please someone help me! asap!!

kramer

Answer:

Last option= 30 minutes

6 0

3 years ago

Construct a 95% confidence interval for the population mean, µ. Assume the population has a normal distribution. A sample of 25

bixtya [17]

Answer:C. (77.29, 85.71)

Step-by-step explanation:

We want to determine a 95% confidence interval for the mean test score of randomly selected students.

Number of sample, n = 25

Mean, u = 81.5

Standard deviation, s = 10.2

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

81.5 +/- 1.96 × 10.2/√25

= 81.5 +/- 1.96 × 2.04

= 81.5 +/- 3.9984

The lower end of the confidence interval is 81.5 - 3.9984 =77.5016

The upper end of the confidence interval is 81.5 + 3.9984 =85.4984

Therefore, the correct option is

C. (77.29, 85.71)

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3 years ago

A quilt is designed using a square pattern. each square contains two rectangles. each rectangle contains a shaded rhombus. each

Xelga [282]

Based on the calculations, the value of x in this rhombus is equal to: B. 55.

<h3>How to determine the value of x?</h3>

Since the opposite angles in a rhombus are always congruent, the sum of each angle in any rhombus must be equal to 360 degrees.

From the image of the rhombus, we can deduce the following parameters:

Adjacent angles = 2x + 20 and 50 degrees.

Opposite angles = 2x + 20 and 50 degrees.

Adding the angles, we have:

2x + 20 + 2x + 20 + 50 + 50 = 360

4x + 140 = 360

4x = 360 - 140

4x = 220

x = 220/4

x = 55°

Read more on rhombus here: brainly.com/question/11586845

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8 0

2 years ago