A swimmer would be able to swim across a 25-meter pool in about 1/5 of a minute. How fast can a swimmer go

Hannah works at the mall selling book bags. she sold 35 book bags in 5 hours. how many book bags did she sell per hour?

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

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