The following information contains information about a function $\backslash ($ f$($x$)\backslash )$ at various values of $\backslash ($ x $\backslash ).$

Use right endpoints and four subintervals to approximate the area beneath the curve of $\backslash ($ f$($x$)\backslash )$ on the interval $\backslash ([4,12]\backslash ).$

Answer: $\backslash (\backslash$quad $\backslash )$ Enter your answer as an exact value $($enter as a fraction if necessary$).$