You ask your best friend to lend you ₹300 to buy your favourite toy. she says she can lend you the money only if you give her an extra ₹3 for every three months that pass before you return it.
what is the total amount you must pay her if you return it after nine months?

After 9 months, you will return ₹309

Step-by-step explanation:

The amount of money you borrowed from your friend is  ₹300.

If you are paying an extra amount of ₹3 every 3 months, then after 9 months, you are paying an extra amount of ₹9

The total amount you must pay her if you return the money after 9 months is  ₹ ₹

Total amount to be paid is ₹309.

Step-by-step explanation:

We are given that the best friend lends us ₹300 to buy a toy on a condition that we must pay her ₹3 for every three months that pass before we completely return it.

So if we return the money in nine months, then we have to pay her ₹9 extra which makes the total amount to be paid ₹309.

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.