Constant: $-4$  Coefficient of the variable: $3$ 
Bob: " Hi, Stanley. What is the coefficient of the variable in this algebraic expression $3x^{2}-4$?"  Stanley:" I can give you a hint. The value of the coefficient is $7$ more than the constant."  Stanley\textquotesingle s hint is~\uline{~~~~~~~~~~}~and the coefficient of the variable is~\uline{~~~~~~~~~~}~. 
a: correct, $3$ 
b: correct, $-4$ 
c: incorrect, $3$ 
d: incorrect, $4$ 