The function C(x)=4x+850 closely approximates the cost of daily production run of x picture frames. The number of picture frames produced is represented by the function
x(t)=90t, where t is the time in hours since the beginning of the production run.
now here's where I need help,
Give the cost of a daily production run, C, as a function of time, t.
how should i go about this and plugging in the other equation?