In the rectangular coordinate system given below, the shaded region is bounded by two straight lines. Which of the following is not an equation of one of the boundary lines?
How many meters of cloth, ^@ 9 \space m ^@ wide, will be required to make a conical tent, the radius of whose base is ^@ 6 \space m ^@ and height is ^@ 23 \space m? ^@
Sahir got an average score of 87.25 in 4 tests. He got 88 as the average of the highest 3 scores, and his lowest two scores are the same numbers. What is the average of his highest two scores?