Evaluate these algebraic expressions if a = 10, b= 5, c = 4 and d=2
1. (a + b) + (c + d)
2. (a + b) − (c − d)
3. (a − b) − (c − d)
4. (a − b) + (c − d)
5. 2c + 3d
6. d 2 + 2a − b
7. a + b + c + d
8. 3c − b
9. 5b − 2d
10.2c2 − 10​