How many significant digits are in 80,000

If f(x)= 3x+6 which of the following is the inverse of f(x)

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)

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