The Johnsons spent a total of ​$69.96 for dinner at their favorite restaurant last night. If this cost included a ​20%​ tip, how much did the dinner cost before​ tip?

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

X2 + y 2 = 36 x + y = 6 solve the system of equations.