Can someone me with the answer to this? ? i don't understand it at all.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x