Simplify me plss cuz i don’t find the answer

Determine domain and range, largest open interval, and intervals which function is continuous.

Which problem would you use the following proportion to solve for? 24/x = 40/100 a. what is 40% of 24? b. what percent is 24 of 40? c. twenty-four is 40% of what number? d. forty percent of 24 is what number?

Find the x-intercepts for the parabola defined by this equation: y=-3x^2-6x+9