Question

A. 15
b. 16
c. 9
d. 14

Answer 1

a. 15
0 +0=0
0 +1 = 1
1+2=3
3+3=6
6+4=10
10+5 = 15

Answer 2

15

Explanation:

1-0 =1

3-1 =2

6-3=3

10-6=4

We are adding 1 more each time

10+5 = 15