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Simplify the following:
-2 sqrt(-49) (sqrt(-4)-3)

sqrt(-49) = sqrt(-1) sqrt(49) = i sqrt(49):
-2i sqrt(49) (sqrt(-4)-3)

sqrt(49)  =  sqrt(7^2)  =  7:
-2 i×7 (sqrt(-4)-3)

sqrt(-4) = sqrt(-1) sqrt(4) = i sqrt(4):
-2 i×7 (i sqrt(4)-3)

sqrt(4)  =  sqrt(2^2)  =  2:
-2 i×7 (i×2-3)

-2×7  =  -14:
-14 i (i×2-3)

i (2 i-3) = -2-3 i:
-14-(3 i)-2

Factor -1 from -(3 i)-2:
-14-(2+3 i)

-14 (-1)  =  14:
Answer: | 14 (2+3i)=28 + 42i

Solve for x:
x^3+2 x^2-5 x-6 = 0

The left hand side factors into a product with three terms:
(x-2) (x+1) (x+3) = 0

Split into three equations:
x-2 = 0 or x+1 = 0 or x+3 = 0

Add 2 to both sides:
x = 2 or x+1 = 0 or x+3 = 0

Subtract 1 from both sides:
x = 2 or x = -1 or x+3 = 0

Subtract 3 from both sides:
Answer: | x = 2       or x = -1        or x = -3

Volume=94.93 L  (liters)=94934 cm^3  (cubic centimeters)

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Equivalent to 6 * 3/2

= (6*3)/2

= 18/2

= 9

21/9.3333333

= 2.25

It really isn't, if you're struggling you just need practise.

Randommm

Fistly why would you format your question so poorly, secondly;

12-3x < 18

-3x < 18 - 12

-3x < 6

3x > 6

x > 2

(-2 sqrt(-49)) = -2*9i = -18i

(-3 + sqrt(-4) = -3*2i = -6i

-18i * -6i = 108i^2 - -108

In standard form, = -1.08 * 10^2

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If you need to know, I would ask your parents. Not trying to sound mean, but this is a place to get help with MATH. 

I'm here too! Altoguh I know I am new on here, so not a lot of people know who I am. :P

7x + 6 = 2x + 41

7x + 6 - 2x = 41

5x = 41 - 6

5x = 35

x = 7

Let's go ahead and start by getting all the x values on one side. So you would subtract 2x from both sides and you would end up with 5x+6=41.

Now we should get the x alone. To do this, we will reverse PEMDAS and start wih getting rid of the addition. To get rid of the addition, you would subtract 6 from both sides. You now should end up with 5x=35.

Then we will get rid of the multiplication by dividing. To get rid of 5x, you would divide by 5, and remember, if you do something to one side, you have to do it to the other side. After dividing 5 from both sides, you should end up with x=7.

So the answer is x=7.

To check your answer, substitute x with 7. 

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