Answer this for brainliest i really need helppp

Which best explains why this triangle is or is not a right triangle?

If a is a nonzero real number then the reciprocal of a is

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?