The set of x values of a function, this is another name for domain

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?

Which expression is the factorization of x^2+10+21

What is the slope of the line that passes through the points (–9, 2) and (0, 4)? the slope of the line is