Im stuck on three questions this one is the first one a little help?

Suppose the probability of selling a car today is 0.28. find the odds against selling a car today.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.