Show that a strictly increasing function f: r + r is injective. does it have to be surjective? 5. prove the second part of proposition 1.4.1. 6. find a function f: x + y and a set as x such that we have neither f(a)

Find the perimeter of the figure shown above. a. 18 yds c. 20 yds b. 10 yds d. 24 yds select the best answer from the choices provided

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90