Need with these 3 math questions on functions .

Q4.

all real numbers greater than or equal to 0.

Q.

The range is read from the y axis. Therefore the range = (-∞ , 1]

{y | y ≤ 0}

Q.

The first part of the graph has a slope = 2, therefore it's y = 2x.

The second part of the graph is horizontal line y= 4.

Therefore your answer is:

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.

step-by-step explanation:

mean or average is 40.6