Write and simplify an expression for the area of the triangle

(show step by step)

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)

It’s 24.6 after you round to the nearest tenths the answer should be 25.0