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2 x 1/5  =  2/1 x 1/5  =  (2 x 1) / (1 x 5)  =  2/5

3.85 x 10³  =  3850

5.02 x 10²  =  502

[(3.84 * 10^3)- (5.02*10^2)]  =  [3850 - 502]  =  3348

6.545 x 10^-2  =  0.06545

3348 x 0.06545  =  219.1266  =  2.191266 x 10²

x²( 8x - 2/5 )( 5x + 6/5 )

=  x²( 40x² + 48x/5 - 2x - 12/25 )

=  x²( 40x² + 38x/5 - 12/25 )

=  20x⁴ + 38x³/5 - 12x²/ 25

(-9 + i)(-9 - i)  =  -9(-9 - i) + i(-9 - i)  =  81 + 9i - 9i - i²  =  81 - i²  =  81 - (-1)  =  81 + 1  =  82

Since you are dealing with complex numbers,  i² = -1, so replace i² with -1.

63i² + 123i - 18  =  63(-1) + 123i - 18  =  -63 + 123i - 18  =  -81 + 123i.

x= 5.3 with a bar notation _

                                      5.3

t=12

-2x + 5y  = 12      add 2x to both sides

5y  = 12 + 2x      divide both sides by 5

y  = [ 12 + 2x ] /  5

w-6 = -4w-11      .......add  6, 4w to both sides......

5w = -5    divide both sides by 5

w =  -1

Without the value of X, the closest you get is to isolate Y

5y = 12 + 2x

W-6 = -4W -11
5 W = -11 + 6   (Isolate W)
5 W = -5           (Sub)
 W= -1

Really? I pity the state of the country when someone has enough know-how to post a question on an online forum, but cannot do basic subtraction. That being said, the answer is 3. Why, you ask? Because 32-20 is 12, and 12/4 is 3. How did I know that 32-20 is 12? Because 1) I know how to subtract, and 2) 3-2=1, and 2-0=2, so 32-20=12.

y=-1/3x-7. Use the formula y=mx+b, where "m" is slope and "b" is your y-intercept. Slope is rise/run, or (y2-y1)/(x2-x1), which is (-4--1)/(7--2), which equals -3/9, which can be simplified into -1/3. Then draw the line (or plug a coordinate into the formula) and find the y-intercept.

Well.... sqrt 1078   is 32.83    so the first one would be 33

            sqrt 5929   is 77         so the last one would be 76  (to be LESS THAN 5929)

     33 - 76  is 44 perfect squares

37 =  -3 + 5(x + 6)     add 3 ro both sides

40 =  5(x + 6)   simplify the right side

40 = 5x + 30     subtract 30 from both sides

10  = 5x     divide both sides by 5

2 = x

Here's a good explanation :  http://www.mathsisfun.com/data/standard-deviation.html

If you need a decimal approximation, use the calculator.

If you need to write it into simplest radical form:

  7546  =  49 x 154

--->     sqrt(7546)  =  sqrt(49) x sqrt(154)  =  7 x sqrt(154)

sqrt(154)  is in simplest radical form because 154  =  2 x 7 x 11

Let the of model boats =B

The number of model cars =B + 5

B + B + 5 + 3 =12

2B=12-5-3

2B=4 divide both sides by 2

B=2 number od model boats

2+5=7 number of model cars, so that:

2+7+3=12