12 inch candle and 18 inch candle lit at 6 pm . 12 inch candle burns 0.5 inch every hour . 18 inch candle burn 2 inch every hour . what time will the 2 candle be the same hight?

How do you find principle and simple interest

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum