I tried search this but it wouldn’t work

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Which graph represents the linear function below? y-3=1/2(x+2)

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