Because of material shortages, it is increasingly expensive…

Because of material shortages, it is increasingly expensive to produce 6.2L diesel engines. In fact, the profit in millions of dollars from producing x hundred thousand engines is approximated by  where  Find the inflection point of this function to determine the point of diminishing returns.

Station 5+00 is a fill section with a cross section area of…

Station 5+00 is a fill section with a cross section area of 750 ft2. Station 6+00 is a sidehill section with a cross section area of cut equal to 70ft2 and fill of 105 ft2. Station 7+00 is a cut section with a cross section area of 850 ft2. At what station(to the nearest station foot) is the cut section expected to taper down to zero? (non-station formatted integer response required; XXXXX, not XXX+XX)