How do i find the coordinates of R and S?

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?