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IrinaK [193]
4 years ago
11

I need help really bad on these questions. they are do tomorrow

Mathematics
1 answer:
Softa [21]4 years ago
5 0
11)
Find two numbers that multiply together to equal 9 * 10 = 90, and add together to equal 21.

9 and 10 do not add to 21.
15*6 = 90
15 + 6 = 21

Since 15 and 6 make both true, then split 21x into 15x and 6x.

9x² + 6x + 15x + 10

Factor a 3x out of the first two terms and factor a 5 out of the last two terms.

3x(3x + 2) + 5(3x+2)

Factor our (3x+2) out of both, leaving you with (3x+5)

9x²+21x+10 = (3x+5)(3x+2)


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What is the slope of the line represented by y = 5x - 7?​
Ghella [55]
The slope of the line is 5/1 because the number by the x is always your slope and it is always to be announced as a fraction so you add 1 as the denominator if there isn’t already a denominator.
6 0
3 years ago
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Rita makes and sells necklaces. The materials to make each necklace cost $2.75. Last week she made 8 necklaces and wants to make
Tresset [83]

Answer:

The error she made was that she was adding x and 2.75. She should subtract 2.75 from x.

Another mistake that she made was that she sold each for $7 assuming that she would make a profit of 78, but she should see each necklace for $12.5 so that she could make a profit of $78.

Step-by-step explanation:

The error she made was that she was adding x and 2.75.

She should write the equation as 8 (x - 2.75) = 78; as she spends $2.75 to make a necklace.

By using the correct equation: 8 (x - 2.75) = 78

=> 8x - 22 = 78

=> 8x = 78 + 22

=> 8x = 100

=> x = 100/8

=> x = 12.5

Another mistake that she made was that she sold each for $7 assuming that she would make a profit of 78, but she should see each necklace for $12.5 so that she could make a profit of $78.

Hope this helps you.

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Correct answer will get brainliest
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I believe its B, But I am unsure since I haven't done geometry in a couple years.

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