Please help me answer this

Write 17/20 as a decimal and as a percent.

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)