5-4+7x+1 use the drop down menu

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

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Can anyone explain to me how to do this? anything will .