(b) Let z = sin 1 (in radians) and let y = v2. Prove that the following statement is false: (z+y € Q) A (r- y é Q). %3D (c) Let ai = 1 and let a2 = n. For n > 3, we define recursively an = an-2 - an-1. Is it true that a2021 is rational? Prove that your answer is correct.

Equations and inequalities describe the relationship between two mathematical expressions.

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.