The incomplete table and histogram give information about the waiting time, in minutes, experienced by patients at a dental surgery.
Time (t minutes)
Frequency
0 30 35
40 t<60
60 20
80 t < 100
10
a) Use the histogram to complete
the table.
b) Use the table to complete
the histogram.
0
20
40
60
Time (t minutes)
80
100
Question Feedback

good job you smart son of a gun you are smarter that einstein. 7

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.