The marcos family consists of 2 adults and 4 children. they spent a total of $40 on circus tickets. let x represent the cost of an adult ticket, and let y represent the cost of a child’s ticket. which graph represents the possible costs of the tickets?

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.