Please help me with this!!

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

Find the axis of symmerty for x y=x squared -4x-8