Sophia: 35w+55-10w

Emily: 28w+75-5w+12

where 'w' is the number of weeks they have been saving

(a) Combine their expressions to see how much they are making together.

(b) Using the expressions, see if they will have above $350 in four weeks. If not, how much will they be short?

(c) If their friend Becky also wants to join and is making money according to the expression: 50w+25, create a new expression for the total and see if they will have above $525 for the three of them after four weeks.

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