The weight, in pounds, of a newborn baby, can be modeled by the function f(x) = 1.5x + 7, where x is the age of the babies in months. According to the function, what is the weight, in pounds, of the baby at age 5 months? PLEASE HELP ME

What is the smallest integer n such that n\sqrt{2} is greater than 20

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.

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.