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Mary's is twice as old as her nephew. The sum of their ages is 108. Write a system of
equations that could be used to find x, Mary's age and y, the nephew's age.
y = 2x
x + y = 108
x = 2y
x + y = 108
x = y +2
* +y = 108
y = x + 2
y = 108 – 2

x + 107

step-by-step explanation:

let's say that the number he had before the mistake was x. then, he will have 107 dollars more than this, so the answer is x + 107.

probability for j is 1/4

while

a is 1/6

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.