Answer:

Step-by-step explanation:
The area of a rectangle can is defined as
where w is the width and l is the length. The width in this case is 12 and the length is 15. Also it doesn't really matter what order you put it in. This gives you an area of 
(6x+1)(-3x+1)
-18x^2-3x+6x+1
-18x^2+3x+1
Answer:

Step-by-step explanation:
This is a 30-60-90 triangle.
It's good to remember this. The side length opposite to the 60 degree angle is always the base multiplied by