Add (1.3t3+0.4t2-24t) + (8-18+0.6t2) for each term in the second polynomial, enter the letter showing where that term should be placed to add the polynomial vertically 1.3t3+ 0.4t2 +(-24t)

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.