3 Superscript 4 in. A rectangle with a width of question mark inches.

The rectangular top of his table has an area of 3 Superscript 7 square inches and a length of 3 Superscript 4 inches. What is the width of the table top?

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.