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3 years ago

Which expression is equivalent to: 5x2 - 10x - 7+ 5x2 + 8?

Mathematics

1 answer:

LenaWriter [7]3 years ago

4 0

Answer:

Step-by-step explanation:

5x² - 10x - 7 + 5x² + 8 = 5x² + 5x² -10x - 7 + 8

= 10x² - 10x + 1

Bring like terms together and add/ subtract the like terms

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consider the equation is Y equals 1/square root of x and y=x-2. approximate solution of the system equations

emmasim [6.3K]

Answer:

$x=1$ and $x=4$

Step-by-step explanation:

We have the following system of equations:

$y=\sqrt{x}$ and $y=x-2$

To solve the problem, we need to equal the two equations:

$x-2=\sqrt{x}$ ⇒ $(x-2)^{2} =x$ ⇒ $x^{2} -4x + 4 = x$

⇒ $x^{2} -5x + 4 = 0$

So you need to find two numbers that added equal to 5 and multiplied equal to 4. These two numbers are $x=-1$ and $x=-4$ .

Then, the factorized form of the polynomial is: $(x-1)(x-4)$ .

The, the solution to the system of equations is: $x=1$ and $x=4$ .

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3 years ago

This is 15 points plz help ( no links ) EXPLAIN YOUR ANSWER plz

goldfiish [28.3K]

A.
EXPLANATION:
The mode is the peak of the data, in this data set, 5/8
The median is the center of data, in the data set, 1/2
5/8>1/2
Mode>Median

6 0

3 years ago

A 3-yard roll of brown paper costs $1.14.What is the unit price HELP PLEASE

Lapatulllka [165]

Per 1 yard the cost would be $0.38. Not sure what unit you need it in, but thats the answer in yards.

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3 years ago

Read 2 more answers

13. Jessica has taken 8 quizzes. The mean of her scores is 92. Her first 6 scores are shown.

Dovator [93]

Answer: Median= 91; 8th quiz score=86

Step-by-step explanation: The sum of the scores is 8×92=736. Subtract the 6 given scores and then a 100 for the seventh quiz to find the score she got on the 8th quiz, this is an 86. Now that you have all the scores, arrange them all in the least to greatest order and find the average of the middle two numbers (median), which is 91!

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3 years ago

20 is how much less than 30? What percent less?

LenKa [72]

Answer:

33.3333% decrease

Step-by-step explanation:

Percent change formula: $\frac{(x-y)}{|y|} *100$ , where x is the new value and y is the starting value.