Enter a system of linear Inequalities to represent the graph if you can answer both much appreciated

The sum of two numbers is 86, and their difference is 20. find the two numbers

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a. the profit when the unit price is equal to 0b. the unit price(s) when the profit is equal to 0c. the profit when the unit price is greatestd. the unit price(s) when profit is greatest

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