53
One possibility is that the sequence continues: 46, 94, 190, ... The difference between the given terms is 3, 6, 12; so the sequence continues by doubling the previous difference: 24, 48, 96, ... and adding it to the previous number.
45 + 46 + 47 + 48 + 122 = 308
31
Adding a negative number has the same effect as subtracting a number. In this instance, -31 + (-46) = -31 - 46 = -77
16-7 + (4) = 29-16, 29-16 + (4)= 46-29, 46-29 + (4) = '67'-46
9
46
A single number, such as 4642142824816 does not constitute a sequence.
46 3/4 - 27
29
42
Eighteen(18)