Find the nth term and first three terms of the arithmetic sequence having u4=93 and u8=65
a + 3d = 93
a + 7d = 65
subtract them
4d = - 28
d = -7
then in a + 3d = 93
a - 21 = 93
a = 114
now that you have a and d, using your formulas, you can find anything they ask for.