Invitations cost $3 for a pack of 8.lori gives the cashier $20 to buy invitations and gets $11 in change. how many packs of invitations does lori buy? explain.

lori bought 3 packs because 20-11=9 and 9 divided by 3 is 3 so lori bought 3 packs

1. 34

2. 268

3. x=14.4

step-by-step explanation:

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.