Two times the sum of a number and 8 equals 4

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

Five infinity stones cost $16.80. what is the price per infinity stone ?

Asoftball team played ten games, scoring 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 runs. they lost by one run in exactly five games. in each of their other games, they scored twice as many runs as their opponent. how many total runs did their opponents score?