g Which of the following functions are injective? (Choose all that apply.) f1:R→R , given by f1(x)=x . f2:R→R , given by f2(x)=x2 . f3:R→R , given by f3(x)=sin(x) . f4:[0,1]→{probability distributions on{0,1}} , given by f4(p)=Ber(p) .

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.

Which equation represents the function on the graph?

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)