If a donut shop sold 150 donuts in 6 hours, and each hour they sold 6 more donuts than the previous hour. what's the total number of donuts they sold in the first 3 hours?

What is the equation of the graph below? y=sec(x)-4

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?

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.