the sum of a certain number ana second number is _42.the first number minus the second number is 52 .find the number ?

I'm just guessing, but my answer would c. 0 to 300.

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)