Imagine there are 100 miners in the bitcoin network, each of whom is capable of calculating 1024 hashes per minute. In order for the network block rate to be 1 block per 10 minutes, how many hexadecimal zeros must we require for our difficulty level

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.