3x^2=-20 so x^2=-20/3 this has no real roots but the plus of minus i(square root of 20/3) is a solution if we allow complex numbers.
To solve this one, subtract 50 from 180 and you'll have your answer.
20 = 400
Yes.
3w + 4 = 24 .......- 4... - 4 .......3w = 20 .......÷3 ...÷3 .........w = 20/3 or 6.6667
205
(3x-4)(x+5)
(20 - x)/5
20
To solve for x, we'd have to know what this expression equals.
To solve this one, subtract 50 from 180 and you'll have your answer.
y=16 x= -4
-7m + 20 = -17m - 1010m = -30m = -3
68
Better formatting is cos(2x+20)=-0.5
3x+5=20 3x=15 x=5
-3x + 5 = 20 -3x = 15 x = -5
20 = 400