What is the product of 2 odd numbers

How do you determine whether a relationship represented as as graph is linear or nonlinear

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

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.