In 2014 the percentage of the U. S. population that speak English only in the home is 78.9% Choose 10 U. S. people at random.

What is the probability that exactly 7 of them speak English only: %

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.