first with offsets:

000c jal     computeX
0014 jal     computeY

(add size of file1 text segment to entries from file2)

0030 lui     $at, inputX
0034 ori     $t0, $at, inputX
0040 lui     $at, outputX
0044 ori     $t0, $at, outputX
0058 lui     $at, inputY
005c ori     $t0, $at, inputY
0068 lui     $at, outputY
006c ori     $t0, $at, outputY

now with addreses (add starting address):

00400030 jal     computeX
00400038 jal     computeY
00400054 lui     $at, inputX
00400058 ori     $t0, $at, inputX
00400064 lui     $at, outputX
00400068 ori     $t0, $at, outputX
00400080 lui     $at, inputY
00400084 ori     $t0, $at, inputY
00400090 lui     $at, outputY
00400094 ori     $t0, $at, outputY