Ive already asked once but could someone please answer this right it is not 4/11 or 2/11 so what could it be??

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?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

Which statement is true about the discontinuities of the function f(x) = x-5/ 3x^2-17x-28