which is an example of the opposite of a sum property?

16 + (–16) = 0

–8 + (–13) = –13 + (–8)

11 + (–14 + 5) = (11 + (–14)) + 5

–(22 + 1) = –22 + (–1)

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Aportion of a hiking trail slopes downward at about an 84° angle. to the nearest tenth of a flot, what is the value of x, the distance the hiker traveled along the path, if he has traveled a horizontal distance of 120 feet? a. 143.3 b. 12.5 c. 120.7 d. 130.2

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.