Help plzzz? Photo attached any which ever ones you want.

2-digit numbers less than 91 which are 1 less than a multiple of 10

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.