The formulas:

Expand the expression:

Plug the values into the expression:
The answer is A( +7) x (-5)
The triangles are shown to be similar, therefore

The answer is 9 units
Answer:
0.43
Step-by-step explanation:
2+3+1+1=7
7*4+28==Area of full shape
(2*4)+(1*4)=12==Area of shaded shapes
12/28=0.428571>rounded up>0.43
Simplified answer would be 60k^2+k
and you get that answer by combining like terms, Good Luck!