Posted by Maura on .
Explain, using the theorems, why the function is continuous at every number in its domain.
F(x)= 2x^2x3 / x^2 +9
A) F(x) is a polynomial, so it is continuous at every number in its domain.
B) F(x) is a rational function, so it is continuous at every number in its domain.
C) F(x) is a composition of functions that are continuous for all real numbers, so it is continuous at every number in its domain.
D) F(x) is not continuous at every number in its domain.
E) none of these
State the domain. (Enter your answer using interval notation.)

Calculus 
Reiny,
The numerator is defined for every value of x you choose,
the denominator is always positive, so there is no danger of us dividing by zero, which would have caused a discontinuity.
so continuous for all values of x
B)