Emma has $26 for her expenses. She spent $12.81, including tax, on a new book. , she needs to set aside $10.00 for a lunch outing next week. If stickers cost $0.42 per package, tax included, the number of packages (p) Emma can buy. 1 point
Emma has $26 - $12.81 - $10.00 = $<<26-12.81-10=3.19>>3.19 left for stickers.
She can buy $3.19 / $0.42 = <<3.19/0.42=7.60>>7.60 packages.
Since Emma cannot buy a fraction of a package, she can buy 7 packages. Answer: \boxed{7}.