F(x)=3x-7 and g(x)=2x-4 find (f+g)(x) and (f-g)(x)

Apackage of orgainc strwberries costs $1.50 while there in season and $2.25 when not in season what the percent increase

What is the value of x? enter your answer in the box.

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.