1. which of the following is an example of an open equation? a. 5x + 7 = 12 b. 12 + (-8) = 4 c. 25 =5(5) d. 8 + 0 = 8 2. which of the following equation has 3 as a solution? a. -2b =6 b. 4a - 5 = 12 c. 5y =y +8 d. z - 15 = -12

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.

10% of 1,900,000. show me how you got the answer

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)