The following function $is$ negative $on$ the given interval.

$f(x)=-4-x^2$;$[3,7]$

$a.$ Sketch the function $on$ the given interval.

$b.$ Approximate the net area bounded $by$ the graph $off$ and the $x-$axis $on$ the interval using a left, right, and midpoint Riemann sum with $n=4.$

$a.$ Choose the correct graph.

$A.$

$B.$

$C.$

$D.$

$b.$ The approximate net area using a left Riemann sum $is$

$(Simplify$ your answer.$)$