(1 point) The two functions y = (3x + 4) and 9 share either an inside function or an outside 3x+4 function. (a) What is this shared function? u = help (formulas) Is u an inside function or an outside function? Choose (b) Writing u for this shared function, express y = (3x+4) in terms of u. y = help (formulas) (c) Writing u for this shared function, express in terms of u. y = help (formulas) 9 3x + 4