Where are the zeros for f(x)=cosx4 on the interval [0,2π]?

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.