3/4•3/4 I can’t do it in my head and I don’t know how to make a decimal into a fraction

The ratio of wooden bats to metal bats in the baseball coach’s bag is 2 to 1. if there are 20 wooden bats, how many metal bats are in the bag?

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.