To find the rule for the given pattern: 1, -3, -7, -11, you need to identify the relationship between the numbers.
Looking at the pattern, we can observe that each number is obtained by subtracting 4 from the previous number:
1 - 4 = -3
-3 - 4 = -7
-7 - 4 = -11
Therefore, the rule for this pattern is to subtract 4 from the previous number to obtain the next number.
To continue the pattern, you would subtract 4 from the last number:
-11 - 4 = -15
So, the next number in the pattern would be -15.