Aman invests a certain amount of that money at 2%interest and $800 more than that amount in another account at 4% interest. at the end of the year he earned $112 in interest. how much money was invested in each account?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.