Ryan is making monthly payments of $42.85 to pay off a 2 1/2-year loan of $1,140. What is his add-on interest rate (to the nearest tenth of a percent)?

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

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How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)