To be able to walk to the center $c$ of a circular fountain, a repair crew places a 16-foot plank from $a$ to $b$ and then a 10-foot plank from $d$ to $c$, where $d$ is the midpoint of $\overline{ab}$ . what is the area of the circular base of the fountain?

Kirnon clinic uses client-visits as its measure of activity. during july, the clinic budgeted for 3,250 client-visits, but its actual level of activity was 3,160 client-visits. the clinic has provided the following data concerning the formulas to be used in its budgeting: fixed element per month variable element per client-visitrevenue - $ 39.10personnel expenses $ 35,100 $ 10.30medical supplies 1,100 7.10occupancy expenses 8,100 1.10administrative expenses 5,100 0.20total expenses $ 49,400 $ 18.70the activity variance for net operating income in july would be closest to: