Assume $y$ Is Directly Proportional to the 4 Th Power Of $x$

Short Answer

Assume $y$ is directly proportional to the 4 th power of $x$ and has a value of 155.58 when $x$ is 4.2 .
(a) Find the constant of proportionality.
(b) Write the equation $y=\mathrm{f}(x)$ .
(c) Find $y$ when $x=0.4$ .
(d) Find $x$ when $y=75.03$ .