How many of the first 999 fibonacci numbers are odd?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

What is the inverse of the function below? f(x)=x/3-2

Zoe paid $18.60 in sales tax in tips for her dinner the sales tax rate is 11% and she tipped 20% what was the price of zoe’s dinner before sales tax and tips