16. insert parentheses where needed in each expression to show how to
get each result.
a. 2 + -3 x 4 = -10
b. 4 + -3 x -4 = -4
c. -12 + 2 + - 4 = 6
d. 8 = -2 + -2 = -6

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.