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Please help this is worth 80% of my grade

What is the slope of the line shown below?

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=

Find the dimensions of the circle. area = 64π in.² r= in.