Multiple Choice QuestionsTwo sides of a rhombus are along the lines, x−y+1=0 and 7x−y−5=0. If its diagonals intersect at (−1, −2), then which one of the following is a vertex of this rhombus?
(−3, −9)
(−3, −8)
(1/3, -8/3)
(1/3, -8/3)
The number of points having both coordinates as integers that lie in the interior of the triangle with vertices (0,0), (0,41) and (41,0) is
901
861
820
820
At present, a firm is manufacturing 2000 items. It is estimated that the rate of change of production P with respect to the additional number of workers x is given by 
. If the firm employs 25 more workers, then
the new level of production of items is
2500
3000
3500
3500
 is equal to 
Switch
 is equal to 
 dx is equal to 
 is equal to
