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7. Laura's parents give her $25 to open a checking account.
a) If she deposits $20 at the end of each week, write an equation that represents how much money is in her account.
b) How much money will she have at the end of the 5th week?
c) What is the y-intercept of this problem?
d) Explain the meaning of the y-intercept in the context of this problem​