This is one of my problems

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question

Commission or salary: jill has a job offer. she is offered either $50 per day or ? 30 per day plus a commission of $3 for every plant she sells. how many plants does she need to sell to make the commission offer the best paying option?