20.3/3.5*0.58 in a standard form​

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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

Find the solution on the interval [0, 2pi)