Martha always tries to exercise at least 30 minutes a day. write an inequality to represent the number of minutes martha exercises each day.

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).