3. Jane and Brittany have been saving up for their summer vacation. After how many days will they have the same amount of money saves?

They will have the same amount of money saved in 4 days

(4) (2x +  3)(x -  1)  =  0 is the same as 2x ^ 2 + x - 3 = 0 
when you multiply 2x   and    x it will give you 2x ^ 2 then you multiply 2x and -1 it will give -2x then multiply +3 and x that will be +3x finally multiply +3 and -1 that will be -3 
  add -2x and +3x that +1x same as +x
so you will get 2x ^ 2 + x - 3 = 0