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What is the sum of this infinite geometric series? Use Sn = a1/1-r

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?

What is the equation of the parabola with focus (-1,-1) and directrix y=1?

You are choosing between two health clubs. club a offers membership for a fee of $ 28 plus a monthly fee of $ 20. club b offers membership for a fee of $ 20 plus a monthly fee of $ 22. after how many months will the total cost of each health club be the same? what will be the total cost for each club? in __ months the total cost of each health club will be the same.