In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Charles has scored 93, 82, and 87 on the first three. What range of scores on the fourth test will give Charles a C for the semester (an average between 70 and 79 , inclusive)? Assume that all test scores have a non-negative value.

Express your answer in interval notation.

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.

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

Three people are traveling and need to exchange the currency of their native country for the currency of the country they are visiting. drag each exchange to the category that shows the ratio of currencies in that exchange.