Each day that Lisbeth rides the train to work, she pays $6.50 each way. If Lisbeth takes the train to work and back 5 times, which amount represents the change in her money?

Y=4x^2+x-1 solve using quadratic formula

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Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.