Astudent has gotten the following grades on his tests: 87, 95, 86, and 88. he needs to have an average of 90 to receive an a for the class. what is the minimum grade he must get on the last test in order to have an average of 90? (measures of central tendency and dispersion)

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.

Can someone me out here number 4 plz

Find the maximum value of p= 4x + 5y subject to the following constraints :