What is the lowest common multiple of 140 and x is 420

Since the lowest common multiple of 140 and x is 420: because 140 divides into 420 three times, x must contain a 3. Since x contains both 20 and 3 as factors, x is 20 · 3 = 60.

the answer is 5636.7

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.