Write out the sum. n (k + 2) k = 1 Find the first, second, and last terms of the sum. n (k + 2 ) = + + + k = 1Write out the sum. n 2 2 K = 1 . . . + 2 k = 1 (Type the first, second, and final terms. Type fully reduced fractions where appropriate.)Express the sum using summation notation. Complete the sum of the sequence. D k=0 we] Express the sum using summation notation. 1+2+3+ . . .+29 1+2+3+ . . . + 29= K = 1