An oil company wishes to run a pipe from point a on the shore to point b on the island (see figure). the island is 5 miles from shore. it costs $1,000 per mile to run cable on land and $2,000 per mile underwater. assume that the cable starts at point a and runs along the shoreline, then angles at point d and runs underwater to the island. if the total cost is represented by c(x) = 1000(8 - x) + 2000 x2 + 25 , use your graphing calculator to find the minimum cost of laying the pipe. round your answer to the nearest whole dollar. a) $16,660 b) $18,000 c) $18,868 d) $8,025