Answer:
D = 13, 13 people
Explanation:
Well we know that there are 29 students in total.
29
Then we know that 16 of them signed up for volleyball and the rest signed up for dodge ball
16+D
So the equation would be.
29 = 16 + D
Subtract 16 by both sides
13 = D
D = 13
Therefore, your answer would be 13 people signed up for dodgeball.