1. 1/n^49 = 0 when n --> oo infinity
2. x^2 = -64
x = 8 i or -8 i
if you have not covered imaginary and complex numbers there is no solution.
3. 12 x because -12x is not a side of a square.
4. no idea, do not have picture
5. if x = -9 or +9
81 + z = 103
z = 22 agree