There are 40 students in a class. Three-fifths (1/5) of the students are boys. a) How many students are boys?
b) How many students are girls?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.

Collin did the work to see if 10 is a solution to the equation r/4=2.4