Solve 3x−5 = 9. Not sure what to do

Ateacher asked his students to vote for an animal to be their class pet. five-eighteenths of the students voted for a rabbit, voted for a snake, and voted for a hamster. which statement is true? more students voted for a hamster than a snake. more students voted for a snake than a rabbit. more students voted for a rabbit than a hamster. more students voted for a snake than a hamster.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?