) 4x+10y=+
ST-1'=-S
help me ):

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

Stefanie is painting her bedroom. she can paint 2 1/3 square feet in 4/5 of an hour. how many square feet can she paint in one hour?