3) an owner of a small store knows that in the last week 54 customers paid with cash, 42 paid with a debit card, and 153 paid with a credit card. based on he number of customers from last week, which fraction is closest to the probability that the next customer will pay with cash? 4) scientists determined that antarctica’s average winter temperature was - 34.44 degrees celsius. the difference between this temperature and antarctica’s highest recorded temperature was 49.44 degrees. what was antarctica’s highest recorded temperature? 7) solve for x. 0.5x + 78.2 = 287

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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.