solve this

Explain. using these theorems. why the function is continuous at every number in its domain. 3 M(x) : lilll +7 M(x) is a polynomial, so it is continuous at every number in its domain. M(x) is a rational function. so it is continuous at every number in its domain. M(x) is an exponential function. so it is continuous at every number in its domain. M(x) is a composition of functions that are continuous on the domain of M(x), so it is continuous at every number in its domain. M(x) is not continuous at every number in its domain. State the domain. (Enteryour answer using interval notation.)