Help with this question please! Photo provided (please show some steps)

as the picture shows, TW is twice RZ, or TW=2(RZ)

if you plug the equations in for the line, you will get:

(5x-20)=2(2x+5)

Then you solve:

5x-20=2(2x+5)

5x-20=4x+10

add 20 to each side

5x-20+20=4x+10+20

5x=4x+30

subtract 4x from each side

5x-4x=4x-4x+30

x=30

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.

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).