HELP!! I don’t know part C or D and I need to know if part A and B are correct

What are the sotions to the quadratic equation 9x^2=4

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

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog