If anyone could help, it would mean the world. thank you

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola 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? write your answer as a decimal rounded to the nearest tenth

Change negative exponents to positive. then solve. round to four decimal places