Final answer:
The expression for Rebekah's spending on Monday, Tuesday, and Wednesday can be written as d, d + $50, and 2(d + $50) respectively.
Step-by-step explanation:
To express Rebekah's spending in terms of an expression, we can start by assigning a variable to represent the amount she spent on Monday. Let's call it 'd'.
On Tuesday, she spent $50 more than she did on Monday, so the expression for Tuesday's spending would be 'd + $50'.
On Wednesday, she spent twice as much as she did on Tuesday, so the expression for Wednesday's spending would be '2(d + $50)'.
Therefore, the expression for Rebekah's spending on each day can be written as follows:
Monday: d dollars
Tuesday: d + $50
Wednesday: 2(d + $50)