PLEASE HELP! Will Mark brainlist

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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

I'm confused on this could anyone me and show me what i need to do to solve it.