Samsung got a good deal on 400 phones. 250 of these phones have 5" screens and the rest have 4" screens. of the 5" screens 140 are silver and the rest are black. out of the 4" screens 80 are silver and the rest are black. if one phone is randomly picked out for a customer. what is the probability that it will: a) be silver or have 5" screen
b) be black or have 4" screen

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.

wth is with the little mtn top and what are you talking about like fix your words and accually make sence with them and i like was in a completly different question like three times like it seems like your ilitteret

two? xd

step-by-step explanation: