the two triangles are congruent
Answer: 
Step-by-step explanation:
The slope of the line is

Using the point (-2, 0) to substitute into point-slope form, we get the equation to be 
0.31 rounded to the nearest tenth would be 0.3
This Chart should help you in the future:
21^2/0.219 = 2013.69863
2 significant figures are the 20, so the answer is 2000
Do 18x18 which equals 324