The Wornskian Test: Use the Wronskian Test in Problems 1-3 to determine if the set of solutions is a basis for the given DE.
1. y(4) = 0, {t + 1, t - 1, t2 + t, t3}
2. y" - 10 y" - 15y' = 0. {te-5t, e5t, 2e5t - 1}
3. y(4) = 0, {t + 1, t2 + 2t, t2 - 2}