Answer:
hope this help !
Explanation:
you should get 16.61 + n = 37 and p = 20.39
since valentina has 37 dollars already, then that is the total amount the she has. When she spend 16.61, you will have to subtract that with 37. with p , you will put a + by it because it should that she bought additional item too. with this, you should get p = 20.39