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3x-9 = -x+7  --> add x to both sides

4x-9 = 7       --> add 9 to both sides

4x = 16        --> divide both sides by 4

x = 4

opps sorry! 3. What is the difference when 2x² - x + 6 is subtracted from x² - 3x - 2 ?

I don't understand what you are asking for in question 3, so I'm going to skip it for now...

4.(x² + 1) - (3x² + 4x - 1)    --> remove parenthesis

x^2 + 1 - 3x^2 - 4x + 1       --> combine like terms

-2x^2 - 4x + 2

2. (a² + a - 1) - (3a² - 2a + 5)  --> remove parenthesis 

a^2 + a - 1 - 3a^2 + 2a - 5      --> combine like terms

3a - 2a^2 - 6                           --> rewrite into standard form for a quadratic (ax^2 + bx + c)

-2a^2 + 3a - 6

2^2005+3^1998=x(mod7)

x=3

1. (3x² + 2xy + 7) - (6x² - 4xy + 3) --> remove parenthesis

3x^2 + 2xy + 7 - 6x^2 + 4xy - 3     --> combine like terms

6xy - 3x^2 + 4                               --> rewrite in standard form of a quadratic (ax^2+bx+c)

-3x^2 + 6yx + 4

1x-8=-2x+7

3x-8=7

3x=15

x=5

18 3/8 - 12 3/4 = 5.625 or 5 5/8

365/179 = 2.0391061452513966

(-6)+(-2) = -8

multiply the neumerator by the whole number

and simplify the fraction

No

4 5/8 = 4.625      #2

4 1/3 = 4.33        #3

√16 = 4               Least

4.83                    Greatest

SOOO-  4.83, 4 5/8,  4 1/3, √16

You must use acos.

flip cos to the other side-

x=acos(8/12)

x=48.189685104221

Use a calculator or well idk

Solve for d:
1.6 d+2/3 = (d-2)/4

Put each term in 1.6 d+2/3 over the common denominator 3: 1.6 d+2/3 = (4.8 d)/3+2/3:
(4.8 d)/3+2/3 = (d-2)/4

(4.8 d)/3+2/3 = (4.8 d+2)/3:
(4.8 d+2)/3 = (d-2)/4

Multiply both sides by 12:
(12 (4.8 d+2))/3 = (12 (d-2))/(4)

12/3 = (3×4)/3 = 4:
4 (4.8 d+2) = (12 (d-2))/4

12/4 = (4×3)/4 = 3:
4 (4.8 d+2) = 3 (d-2)

Expand out terms of the left hand side:
19.2 d+8 = 3 (d-2)

Expand out terms of the right hand side:
19.2 d+8 = 3 d-6

Subtract 3 d from both sides:
(19.2 d-3 d)+8 = (3 d-3 d)-6

19.2 d-3 d = 16.2 d:
16.2 d+8 = (3 d-3 d)-6

3 d-3 d = 0:
16.2 d+8 = -6

Subtract 8 from both sides:
16.2 d+(8-8) = -6-8

8-8 = 0:
16.2 d = -6-8

-6-8 = -14:
16.2 d = -14

Divide both sides of 16.2 d = -14 by 16.2:
(16.2 d)/16.2 = (-14)/16.2

16.2/16.2 = 1:
d = (-14)/16.2

(-14)/16.2 = -0.864198:
Answer: |d = -0.864198= - 70/81

1,760 x 3 =5,280 feet = 1 Mile