2.2 For each of the following systems, specify whether or not the system is: (i) linear and/or (ii) time-invariant. (a) y(t) = 3x(t − 1) (b) y(t) = t x(t) (c) dy dt + y(t − 1) = x(t) (d) dy dt + 2y(t) = t −[infinity] x(τ ) dτ (e) y(t) = x(t) u(t) (f) y(t) = [infinity] t x(τ ) dτ (g) y(t) = 2t t x(τ ) dτ

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.

The trigonometric ratios sine and secant are reciprocals of each other

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?