It's given a function of f(x) = x³ - 7x + 15x - 10

a) Determine the y-intercept of f(X)

b) Determine the critical points of f(x)

c) Determine intervals where f(x) is increasing or decreasing. As a result, determine the extremum points of f(x)

d) Determine interval(s) where f (x) is concave up or concave down. Hence, determine the inflection point of f(x)