Consider the numbers z= 2 + 5i, w = -3- 2i, and u=-1+2i. z+w is equal to -1+vi
w-u is equal to - 4i
u + w is equal to -4 -

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?