445.3 round to the nearest ten thousand

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas