Evaluate the expression 72/x2-2 for x=3

Select the quadratic that has root x = 8 and x = -5

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

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.