Mary has an interest in music. she loves to buy cd's and cell phone ringtones. each cd, c, cost $14 and each ringtone, r, cost $2. she only has a budget of $50. write an inequality to represent this situation.

5500 dollars is placed in an account with an annual interest rate of 6.5%. to the nearest tenth of a year, how long will it take for the account value to reach 19700 dollars?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?