Please help me with these questions FAST it's formal and I can't fail,

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

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.

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases