Ajeweler buys a ring from a jewelry maker for $125 he make up the price by 135% for sale in a store what is the selling price of the ring with 7.5% sale tax ?

How do you use the elimination method for this question? explain, because i really want to understand!

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Einstein office equipment has a rental plan for office machines. a fax machine that lists for $722.98 can be rented for 22% of the price annually. the state imposes a usage charge of 3.2%. if stephen hawking travel decides to rent the fax machine, what will its total monthly rental charge be?