There are 20 pens in a package. ten of the pens are black, 8 are blue, and the rest are red.

which ratio represents the number of red pens to black pens?

1/10

1/5

4/5

5/1

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