Answer :
Part a)
we have
58, 57, 56,
68, 67, 66
answer part A is 66
Part b
we have
3,4 ------> incresases 1
4,6 ------> increases 2
6,10 ----> increases 4
10,18 ------> increases 8
therefore
the next number will increase 16
so
the next number is 34
answer part b is 34
Part c
10 , 54 ------> increases 44
54,98 ------> increases 44
98, 1312 -----> increases 1214