Express the series using sigma notation 6b + 3b + 0 + (-3b) + (-6b).

Long division the problem is 40 ➗ 348 = ?

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.