I'm confused and pythagorean theorem him if you were given c squared how do you find a and b squared

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

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

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?