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2 years ago

Someone please simplify these

Mathematics

1 answer:

Setler [38]2 years ago

4 0

1. 3x + 12x - 3y

15x - 3y

2. 14x + 3(y+5) - 2y

14x + 3y + 15 - 2y

14x y + 15

3. 2x² + x + 3x - 5

2x² + 4x - 5

4. 4y² + 7 - 3y² + 25

y² + 32

5. 2x(3+x) - 6x

6x + 2x² - 6x

2x²

6. y + 13 - 9

y + 4

7. 8(x-4)

8x - 32

8. 4y² + 7y + 8y²

12y² + 7y

9. 26 + x(3+4x)

26 + 3x + 4x²

4x² + 3x + 26

10. 10y + 8x + 98 - 70 + 16y

26y + 8x + 28

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denis-greek [22]

Answer:

x = 22

Step-by-step explanation:

I interpreted your problem as:

$\frac{1}{2} (x+18) = 4(2x-6)-9x$

I simplified the problem to:

$\frac{1}{2} x+9 = 8x-24-9x$

I combined like terms:

$\frac{1}{2} x+9 = -x-24$

I moved all x to one side and all other constants to the other:

$\frac{3}{2} x = -33$

I divided by 3/2 (1.5) on both sides to isolate x:

$x = 22$

Hope it helps! (:

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3 years ago

Need help! Law of cosines...find b round to the nearest tenth please

dusya [7]

ANSWER

$B = 27.8 \degree$

EXPLANATION

The law of cosine is given by the formula:

${b}^{2} = {a}^{2} + {c}^{2} - 2bc \cos(B)$

From the diagram,

a=17, b=8, c=16

We substitute the given values into the formula to obtain:

${8}^{2} = {17}^{2} + {16}^{2} - 2(17)(16)\cos(B)$

$64 = 289+ 256- 544\cos(B)$

$64 = 545- 544\cos(B)$

$64 - 545 = - 544\cos(B)$

$- 481 = - 544\cos(B)$

$\frac{ - 481}{ - 544} = \cos(B)$

$cos(B) = 0.88419$

$B = \cos ^{ - 1} (0.88419)$

$B = 27.8 \degree$

3 0

3 years ago

Read 2 more answers

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nirvana33 [79]

Answer:

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Step-by-step explanation:

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