So I have this math problem

How do I solve for the annual interest after three years? Do I plug in 3 for r?

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost