What is the largest perfect square less than 225 that is a multiple of 9?

144 is the answer

7^2 = 144
144/9 = 16 therefore a multiple of 9

C. 40,320 just did the math right now

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)