Surface area helpp me

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

The graph shows how many words per minute two students read. drag to the table the unit rate that matches each graph.

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.