In the figure shown, which pair of angles must be complementary? ∠AOC​ and∠COD

∠COD and ∠DOB

​∠AOC​ and ​∠DOB​

​∠COB​ and∠AOC
4 rays sharing point O. Ray A O, ray C O, ray D O, and ray B O in that order from left to right. Angle C O B is a right angle. ray D O is between ray C O and B O. Ray A O is on the left of ray C O and is acute.

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 number line represents the solution set for the inequality -1/2x> 24?

If the value of cos330°is√3/2 then find cos 165°.