Please help and explain#5 and #6

A half adder is a circuit that adds two bits to give a sum and a carry. Give the truth table for a half adder, and design the circuit using only two gates. Then design a circuit which will find the 2's complement of a 4-bit binary number. Use four half adders and any additional gates. (Hint: recall that one way to find the 2's complement of a binary number is to complement all bits, and then add 1) 5- 6- Find the minimum sum of products for each function using a Karnaugh map. (a) fi(a, b, c) mo+ m2 + m5 + m (b) f2(d, e, f Im(0, 1, 2, 4) (c) fs(x, y, z) xz' +x'y+x'y (d) falr, s, t) Mo. Ms