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Charra [1.4K]
3 years ago
6

class="latex-formula">




Free
Mathematics
2 answers:
sergij07 [2.7K]3 years ago
5 0

\sf \longmapsto \: 2x  +  21 = 3

\sf \longmapsto2x = 3 - 21

\sf \longmapsto2x =  - 18

\sf \longmapsto \: x =  \frac{ - 18}{2}

\sf \longmapsto x =  - 9

grigory [225]3 years ago
3 0

Answer:

\sf 2x+21=3

\sf 2x+21-21=3-21

\sf 2x=-18

\sf \cfrac{2x}{2}=\cfrac{-18}{2}

\boxed{\sf x=-9}

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3 years ago
The area of the base of a square notepad is 2.25 square inches. What is the length of one side of the base of the notepad?
scoundrel [369]

Answer:

1.5 inches

Step-by-step explanation:

Because the base of the notepad is a square, that means that each side of the base would be equal. Since the area is 2.25 square inches, and each side would have to be equal, the equation to solve would be x*x = 2.25, or x^2=2.25. So, you just take the square root of both sides, and x=1.5 inches. Each side of the notepad would be 1.5 inches.

4 0
3 years ago
Let tk(x)tk(x): be the taylor polynomial of degree k of the function f(x)=sin(x)f(x)=sin⁡(x) at a=0a=0.suppose you approximate f
Aloiza [94]
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PLEASE HELP!! WILL AWARD BRAINLIST TO WHOEVER HAS ALL THE CORRECT CALCULATIONS!
Gekata [30.6K]

Law of cosine:

c² = a² +b² -2ab*cosC.

Because the triangle is equilateral a=b=c=x,

and we can write,

x²=x² +x² -2xx*cosC

x² =2x² -2x²* cos C

-x² = -2x²*cos C

cos C= 1/2,

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Because all sides are equal, and across of the equal sides should be equal angles, all angles will be also equal and = 60⁰.

8 0
4 years ago
Read 2 more answers
How to solve 5(2b-3)-1(11b+1)=20
son4ous [18]

Answer:

b = -36

Step-by-step explanation:

Start by distributing both th 5 and the negative 1 into their corresponding parentheses.

((5*2b)-(5*3)) > (10b - 15)

((-1*11b)+(-1*1)) > (-11b - 1)

so you have:

10b - 15 - 11b - 1 = 20

Next you would Combine like terms to get:

-b - 16 = 20

Add the 16 to both sides

-b = 36

and divide each side by -1

b = - 36

hope this helps

3 0
3 years ago
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