In division, why should the remainder not be greater than the divisor

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Solve the equation. 2x - 8(x+1)= 6(2x - 3)

Last month, leonhard euler's watch kiosk at the mall had total sales of $9,489. merchandise totaling $225 was returned. the goods that were sold cost leonhard euler's $5,481. operating expenses for the moth were $992. what was the gross profit on sales?