Tickets sold to the valentine dance costs $3 per person or $5 per couple. if $475 worth of tickets were sold and 180 people attended the dance, how many couples were there?

What kinds of numbers make up the set of numbers called the real numbers? give examples when you explain a number type. there are a limited set of types of numbers, but an unlimited number of examples of these numbers.

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?