One sample of n=10 scores has a mean of m = 8, and a second sample of n=5 scores has a mean of m=2. if the two samples are combined, what is the mean for the combined sample?

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.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.