First, you need to know what a complementary angles are.
They are two angles that add up to 90 degrees.
If the number multiplied by 2 is 90, just to 90/2.
This gives you 45
(20*30)/2 = 300
300 km is the area of the triangle
Answer:
3x+12y+4 -- is the simplified version, variables would be x and y
The third option is correct
Answer:
just put like what oh yea put 72
