Find each sum or difference
 1. -1/2 + 1/3 
 a. -1/6
 b.-1/3
 c.2/3
 d.1/6
 2. -3 1/5 + (-6 1/2) 
 a. -3 2/7 
 b. -3 7/10 
 c. -9 2/7 
 d. -9 7/10 
 3. 5/8 - (-2/8)
 a. -3/8
 b. -7/8
 c. 3/8
 d. 7/8
 4. -9/10 - 2/5
 a. -1 3/10
 b. -1 1/10
 c. -7/10
 d. -5/10
 5. 6 3/5 - (-2 1/5)
 a. - 8 2/5
 b. -4 2/5
 c. 4 2/5 
 d. 8 4/5
 Please help, its currently 3:53 am...