Given ghi with g(4 -3), h (-4, 2), and i (2, 4), find the perpendicular bisector of hi in standard form

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

How do i do this activity, is appreciated

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?