D. X = 10
6x-20= 40
6x=40+20
6x=60
X=10
Take 1.3x1.5 and i think that will give you your answer
<span>1.Take the principle square root of a negative number.
2 Write a complex number in standard form.
3.Add and subtract complex numbers.
4.Multiply complex numbers.
5. Divide complex numbers.</span>
The answer to this problem would be 3a +3b
