X = a + bi
y = c + di
xy = yx
(a + bi)(c + di) = (c + di)(a + bi)
a(c + di) + bi(c + di) = c(a + bi) + di(a + bi)
a(c) + a(di) + bi(c) + bi(di) = c(a) + c(bi) + di(a) + di(bi)
ac + adi + bci + bdi² = ac + bci + adi + bdi²
ac + adi + bci - bd = ac + bci + adi - bd
Answer:
see explanation
Step-by-step explanation:
Using the sine and cosine ratios in the right triangle
sin30° =
= 
Multiply both sides by y
y × sin30° = 6 ( divide both sides by sin30° )
y =
=
= 12
---------------------------------------------------------------------------------------
cos30° =
= 
Multiply both sides by y ( y = 12 )
12 × cos30° = x
x = 12 ×
= 6
700 because if it was 750 it would be closer to 800 but it is under 50
Answer:
I'm confused by the layout of the first two, but I can help you with the last one!
The last one is C!
Step-by-step explanation: