If I follow the angle degrees that they gave, your answers would be as follows:
I=145°
S=155° or 90°
E=78°
L=120° or 55°
Maybe this is right, sorry it took so long.
To find the exact answer based on the last step, "
", you must use PEMDAS (attached image below)

Thus the answer is <u>59</u>.
Hope that helps!
Write the folowing in standard form and you well get
#1 is 5b
#2 is b−8x+<span>4</span>
Yes, because it still have 3 sides.