HELP I cant figure it out

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?