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3 years ago

Simplify 3x + 6x^2 - 5x - x^2

Mathematics

2 answers:

just olya [345]3 years ago

8 0

Answer: -2x + 5x^2

Step-by-step explanation:

3x + 6x^2 - 5x - x^2 = x(3-5) + x^2(6-1) = -2x + 5x^2

Evgen [1.6K]3 years ago

5 0

Answer:

Answer = x ( 5x - 2)

Step-by-step explanation:

3x + 6x² - 5x - x²

Collect like terms

= 6x² - x² - 5x + 3x

= 5x² - 2x

= x ( 5x - 2)

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a contractor charges 1,200 for 100 sq ft of roofing installed how much does it cost to have 1,109 sq ft installed

Kruka [31]

Answer:

13308

Step-by-step explanation:

100 sq ft=1200

1109sq ft=?

1109*1200/100=13308

7 0

3 years ago

In 2\3 of an hour, the workers had installed 2/5 of the flooring. At that rate, what fraction of the flooring is finished after

AleksAgata [21]

Answer:

3/5

Explanation:

In 2/3 of an hour, the fraction of flooring installed = 2/5

Therefore:

$\begin{gathered} In\text{ 1 hour, the fraction of flooring installed} \\ =\frac{2}{5}\div\frac{2}{3} \\ =\frac{2}{5}\times\frac{3}{2} \\ =\frac{3}{5} \end{gathered}$

3/5 of the flooring is finished in 1 hour.

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1 year ago

Solve for the angle denoted by the "?". Round to the nearest tenth.

katovenus [111]

<h3>Answer: 35.4</h3>

====================================================

Explanation:

Let x be the reference angle where the question mark is located.

Opposite this angle x is 27. The adjacent side is 38.

Use the tangent ratio to tie the two sides together

tan(angle) = opposite/adjacent

tan(x) = 27/38

x = arctan(27/38)

x = 35.3947958 .... which is approximate

x = 35.4

Be sure that your calculator is in degree mode. The notation "arctan" refers to "arctangent" which is the same as inverse tangent. Your calculator should have a button labeled $\tan^{-1}$ to help compute this.