Answer:
12units^2
Step-by-step explanation:
Here is the areas of all the individual shapes within,
since the triangles are right triangles and half of a rectangle you can do LxW/2
42 - 2x is the answer because x is the variable standing in for the number that will be multiplied by 2 (2x means 2 times something) and decreased by just means minus. if you haven't gotten to doing 2x then do 42 - 2*x