Please help me with this

Plzzz asap what is the inverse of f if f(x)=^3 sqrt x-5

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

What is the absolute value of the complex number -4-sqrt2i