Ameeting room has 8 rows of seats. each row has 15 seats. if 5 rows are full and there are three people in the next row, how many seats are empty? explain your answer.

Pls an ice cream shop sells 5 times as many cake cones as waffle cones use variable x to represent the number of waffle the ice cream shop sells and use this variable to write an expression for the number of cake cones the ice cream shop sells. enter the expression for the number of cake cones the ice cream shop sells

Simplify the expression. -2/5(10+15m-20n)

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.