Question number 12. at + + + 3t + 3 Given lim t-+0o bac13 + +3 + 3t + 3 2, find the value of a + b. 0 52 O 26 00 0 39 0 13 O None of the above.Question number 11. Find the value of a such that the limit holds true: lim ax3 + 4x2 - x - 1 = -5 x-+00 3x3 + 22 - 9 Oa = - Oa = -15 Oa = -5 Oa = 0 O a = - O Does not exist. Oa = 3 O None of the above