3. All TV technicians carry a 15-pound tool belt. Which equation best represents the
relationship in the table?
Weight of tv
TECHNICIAN (+)
130
150
170
190
210
TOTAL weight (W)
145
165
185
205
225
A. † = W + 15
B. f = 15w
C. W = † + 15
D. W = 151

the answer will be

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.