Define a variable, write an inequality, and solve each problem. check your solution.
1. half of a number is at least 14
2. the opposite of 1/3 a number is greater than 9
3. 1/5 of a number is at most 30

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.