Final answer:
The two equivalent expressions to represent how much Vanna can earn mowing and raking grass are V + E and V(1 + 3.5) + E(1 + 3.5).
Step-by-step explanation:
To represent how much Vanna can earn mowing and raking grass, we can use two equivalent expressions. Let's say V represents Vanna's rate and E represents her expenses.
The first expression would be V + E, which represents the total amount she earns considering her rate increase and expenses increase. The second expression would be V(1 + 3.5) + E(1 + 3.5), which represents her new rate and expenses respectively.