Factorize ax-ay-by+bx

Determine which postulate or theorem can be used to prove that lmn =nmo

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.

What is the value of -3/4 to the 4th power? -256/81 -81/256 81/256 256/81