A drug is injected into a patients bloodstream through her right arm. The drug concentration in the blood stream of the left arm t hours after the injection is given by the function given below. Find the instantaneous rate of change in the concentration of the drug after 3 hours

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.

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?