Create this problem: 8x2- 2x +4 = 16 as a word problem?

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2