Radius of the pan = 16cm
Formula for area of circle:

Find the area of the pan:

I would say its the second one.
the student shouldve distributed the 2^3x+3 into 2^3x+9
let the unknown answer be equal to f
.-2.1 - f = -3/2
-f = -3/2 + 2.1
-f = 0.6
f = -0.6
Alan drew a rhombus, all four side are equal but none of the angles are right.