I have issues with finding area with midpoint

if steps can be provided, I would appreciate that! Thank you!

$(1$ point$)$ Graph the function f$($x$)=5$x$-6$ln x quad x

$($a$)$ Estimate the area under the graph of f using four approximating rectangles and taking the sample points to be right endpoints. Then sketch the four

rectangles on the graph.

Area is approximately

$($b$)$ Now repeat part $($a$),$ but take the sample points to be midpoints instead.

Area is approximately

$($c$)$ Now repeat part $($a$),$ but use eight rectangles instead.

Area is approximately

$($d$)$ Now repeat part $($c$),$ but take the sample points to be midpoints instead.

Area is approximately