Pls help me (it has a timer)

Is a positive integer raised to a negative power always positive

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

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