Total number of students - number of students who took 50 mins
120 - 116 = 4
The value is 11.
121^1/24 is actually square of 121^1/12
so x= square of 121 = 11
The first one,7
good luck!!
Y=-4
compared to focus
(3,-7)
vertex is in middle
so
-4 and -7, the average is -5.5
so vertex is (3,-5.5)
and distance from vertex to focus is from -5.5 to -7 or 1.5
focus is below vertex is p is negative
(x-3)^2=4(-1.5)(x+5.5)
(x-3)^2=-6(x+5.5)
D is answer