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good for you... *claps sarcasticly*

n=3

Solve the n\3+4=8

n/3 + 4 = 8 subtract 4 from both sides

n/3 = 4 multiply both sides by 3

n = 12

Use the small letter "e" in the top row.

what does (-r-s)-(-s-r) equals

Simplify the following:
-r-s-(-s-r)

-(-r-s) = r+s:
-r-s+r+s

Grouping like terms, -r-s+r+s = (s-s)+(r-r):
(s-s)+(r-r)

s-s = 0:
r-r

r-r = 0:
Answer: 0

what is -3 1/3(-2 7/10)=

-3 1/3 x -2 7/10

-10/3 x -27/10

270 / 30 = 9

0.03*1/12 = 1/400

Solve for x over the real numbers:
-27+3^(2 x)-2 3^(x+1) = 0

Simplify and substitute y = 3^x:
 -27+3^(2 x)-2 3^(x+1) = -27-6×3^x+(3^x)^2 = y^2-6 y-27 = 0:
y^2-6 y-27 = 0

The left hand side factors into a product with two terms:
(y-9) (y+3) = 0

Split into two equations:
y-9 = 0 or y+3 = 0

Add 9 to both sides:
y = 9 or y+3 = 0

Substitute back for y = 3^x:
3^x = 9 or y+3 = 0

9 = 3^2:
3^x = 3^2 or y+3 = 0

Equate exponents of 3 on both sides:
x = 2 or y+3 = 0

Subtract 3 from both sides:
x = 2 or y = -3

Substitute back for y = 3^x:
x = 2 or 3^x = -3

3^x = -3 has no solution since for all z element R, 3^z>0 and -3<0:
Answer: |x = 2

1/5[10-5(x-2)]=1/10(x+1) multiply both sides by 10

2[10-5(x-2)] = (x+1)

2[10 -5x +10] = x + 1 get rid of the inner bracket

20 - 10x +20 = x + 1 distibute 2 on the LHS.

-10x + 40 = x + 1 subtract x and 1 from both sides

-11x + 39 = 0 subtract 39 from both sides

-11x = - 39 divide both sides by -11

x = 39/11 =3 6/11

5 2/3

it is 12.66666666667

Solve for x:
(10-5 (x-2))/5 = (x+1)/10

-5 (x-2) = 10-5 x:
(10-5 x+10)/5 = (x+1)/10

Add like terms. 10+10 = 20:
(20-5 x)/5 = (x+1)/10

Multiply both sides by 10:
(10 (20-5 x))/5 = (10 (x+1))/10

10/5 = (5×2)/5 = 2:
2 (20-5 x) = (10 (x+1))/10

(10 (x+1))/10 = 10/10×(x+1) = x+1:
2 (20-5 x) = x+1

Expand out terms of the left hand side:
40-10 x = x+1

Subtract x from both sides:
40+(-10 x-x) = (x-x)+1

-10 x-x = -11 x:
-11 x+40 = (x-x)+1

x-x = 0:
40-11 x = 1

Subtract 40 from both sides:
(40-40)-11 x = 1-40

40-40 = 0:
-11 x = 1-40

1-40 = -39:
-11 x = -39

Divide both sides of -11 x = -39 by -11:
(-11 x)/(-11) = (-39)/(-11)

(-11)/(-11) = 1:
x = (-39)/(-11)

The sign of (-39)/(-11) is positive, so (-39)/(-11) = 1×39/11:
Answer: |x = 39/11

Just add them all up and divide the result by 3. That is your mean.

It is right there in front of you. Just look to the right of zero!!!.