Robyn makes and sells homemade bracelets she made $87.25 last week this week she donated some bracelets to charity so her profit at the end of this week can be represented by -$12.50 part a write a subtraction and addition expression to represent robyns total profit for the two weeks combined part b write an expression for the difference between last week profit and this weeks profit. What is the difference in dollars between last weeks profit and this weeks profit