I need the answer to this.

Customers at an ice-cream shop took a survey .the results showed that 144 customers rated the shop as being "very satisfactory ."this number represented 45%of the total nunber of customers who took the survey

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?