Liz bought 16 3 cents stamps and used them to mail 2 letters to her grandparents. if each letter used the same number of stamps ,how much did it cost to mail each letter

16/2 = 8 stamps each

8 × .03 = .24

It cost 24 cents to mail EACH letter

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)