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Whats the domain of f -1(x)? How is logging (deforestation) a problem? A quadratic function f(x)=ax^2+bx+ c has a maximum point at (2,20) and cuts the y-axis at y=8. Find the values of a, b and c? Soon i'll be a graduate student (Electronics engineering), would it be worth it to start taking CCNA course from Cisco and going up? Can mass be defined in terms of both a magnetic field and a gravity field?