Museum passes cost $5 for adults and $2 for children. one day the museum sold 1820 passes for $6100. how many of each type were sold

You download a video game to your computer. you have a 60-minute free trial of the game. it takes 5 1/6 minutes to set up the game 7 1/3 minutes to play each level. you want to find out how many levels you can play for free. which inequality describes the number of levels, l, you can play in 60 minutes? can you play 6 levels during your free trial? i need ,

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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