Uses fewer than 5 coins to pay 60 c

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?