+ 8

-4                           [ IF PLUS AND MINUS COMES THEN U HAVE TO SUBTRACT AND       

                                          PUT THE SIGN OF THE GREATER NUMBER]


+ 4


hey she asked for sum not multiplication
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pllllzzzzzzzzzzzzzzzzzzzzzzzzzzzzz mark as the best ,,,,mine is more understandable than hers pls
the answer is 4
+4 and 4 are same dear
+8-4=4                                                                            since+-=-
1 5 1
hey my answe is correct or wrong
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since i helped first in correct way pls mark as best