CPhill

0.9  =  9 / 10

LOL!!!!!......thanks  JDW  !!!!!

A  M  E  N     !!!!

We have two vectors

(520 cos 30, 520 sin30)  and  (50cos 15, 50 sin15)

x value of resultant  vector   =

520cos30 + 50 cos15  ≈  498.63  mph

y  value of  resultant  vector  =

520 sin 30 + 50sin 15   ≈ 272.94  mph

 Resultant  speed  =  √[ 498.63^2 + 272.94^2 ]  ≈  568.4  mph

Resultant   angle  =

arctan ( 272.94/498.63)   = θ  =  28.7°

  " its  "  instead  of   " it's " .......   !!!!!!

1.   The 'opposite' of a number is it's negative  ....so we have....

7N  =  −N + 56      add N to both sides

8N  = 56   divide both sides by 8

N  = 7

Proof

7(7)  = −7 + 56

49  = 49

(9)   ( 2 + 3i) (2 − 3i)  =   4  − 9i^2   = 4 − 9(−1)  =  4 − (−9)   =  2^2 + 3^2 =  13

A real number

The product of a complex number and its conjugate always produces this real number →

(a + bi) (a −bi)  = a^2 − (b^2 )(i^2)   = a^2 − ( b^2) ( −1)  = a^2  − ( −b^2)  = a^2 + b^2    !!!!!

What is 6x+9y = 28,  x=6

6(6) + 9y  = 28

36 + 9y  = 28      subtract 36 from both sides

9y  =   −8             divide both sides by 9

y = − 8/9       when x = 6

If I  read it correctly ....here's   6

$[5x]      for    0 ≤ x ≤ 10

$[50]      for    x > 10

Hey, Complex......welcome back....!!!