Help urgent.. : Irum is sitting on the beach, watching the tide go in and out.
Irum's distance from the shoreline (in meters) as a function of time (in
hours) is graphed.
What is the approximate average rate at which Irum's distance from
the shoreline increases, between the 9th and the 13th hour marks?

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.