28 er +1 Which one of the following is a correct step in computing the derivative of Select one alternative: 2(e# + 1) - re Tex - 2ex - 2 2x over -are" + 2x 29 1 1 1 1 Which of the following is the sigma notation for the series + 27 81 243 729 Select one alternative: o I(-3)-1 o CI-(3-1)] 1-3 o El(-3)'] o [ (3-1 ) 1=3 30 a+1 Which of the following is equal to _2 , {a EN : a > 2}? i=3 a+1 Note: If i = 1, ) 2 = 2(a + 1). i=1 Select one alternative: O 2a + 3 O 2a - 2 O 2a + 2 O 2a - 3