Jatonia sold n cups of lemonade at her stand for $0.75 each. she made a total of $18.00. write an expression to express how many cups of lemonade she sold.

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.