After being dropped a certain ball always bounces back to 2/5 of the height of its previous bounceAfter the first bounce it reaches a height of 125 inchesHow high (in inches) will it reach after its fourth bounce?

A20
B15
C8
D5
E3.2

8 inches.

Step-by-step explanation:

In the first bounce, the height that the ball reaches was 125 inches.

If the ball always bounces back to of the height, then after 2nd bounce it will reach inches height.

Again, after 3rd bounce, it will reach inches height.

And, after 4th bounce, it will reach inches height. (Answer)

the answer is 37

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.