Riley and her roommate use the company Web max for their Internet service. Web Max charges $0.03 per minute, plus a monthly flat fee for a modem. Last month for their total bill, Riley paid $31 and her roommate paid $20. If they used the Internet 1300 minutes, how much must the modem cost per month? Plz show work

12$

Step-by-step explanation:

1300×0.03=39

31+20=51

51-39=12$

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

plz yuo

step-by-step explanation: