The selling price of an item is $390. it is marked down by 10%, but this sale price is still marked up from the cost of $270. find the markup from cost to sale price.

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?

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