Jill went out to dinner and left a 15% tip. the cost of the bill is represented by b . the total amount jill paid is represented as b+0.15b= b, which means that an increase of 15% is the same as

Jill went for dinner

Let the total cost of the dinner = b

He gave 15% tip, then 15%(b) =0.15b

Total cost of the bill = b+0.15b = 1.15b = b

Percentage increase =

                                  = 15%

The cost of the dinner is increased by 15% as he gave the bill.

Therefore, increase of 15% is the same as the percentage of bill.

2

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.