Evaluate (212)\(_3\) - (121)\(_3\) + (222)\(_3\)

Factorise (4a + 3) \(^2\) - (3a - 2)\(^2\)

Find all median of the numbers 89, 141, 130, 161, 120, 131, 131, 100, 108 and 119 

Find all real number x which satisfy the inequality \(\frac{1}{3}\) (x + 1) - 1 > \(\frac{1}{5}\)(x + 4) 

Reach each number to two significant figures and then evaluate \(\frac{0.02174 \times 1.2047}{0.023789}\)