David told jen, "write three two-digit numbers. i'll add three more and give you the sum right away." jen wrote 53, 42, and 31. then david wrote 46, 57, and 68 and said the sum was 297. was he right? what pattern did he use?

He is correct. The pattern is -11,-11+15,+11 and +11

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)

P(chicago, illinois)