Evie has scores of 72, 78, 80 and 84 on four science quizzes. what score must she get on the next quiz to have an average of at least 80?

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?