Write the Coefficient of Each Term $x$ Is the Variable and All Other Letters Are Constants

Short Answer

Write the coefficient of each term. Assume that the letter $x$ is the variable and all other letters are constants.
(a) $\frac{a x^{4}}{4}$
(b) $2 a(5 bx^4)$
(c) $\frac{6 b x^{7}}{2 a c}$