Simplify the expression : 21d + 5f - 11d + 8 - 5\
A 10d+5f+3
B 33d+5f+13
C 15df+3
D 21d-6f-3
To simplify the expression 21d + 5f - 11d + 8 - 5, we can combine like terms.
21d - 11d is equal to 10d.
The terms 5f and -6f can be combined to give -f.
Finally, the terms 8 and -5 can be combined to give 3.
Therefore, the simplified expression is 10d - f + 3, which corresponds to option A, 10d + 5f + 3.