Someone solve with work much appreciated

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

Of the 189 miles of beaches at ocean side, 7% are privately owned 39% are owned by resorts, and 54% are public beaches. how many miles of beach are not public?