There are approximately 113 million TVs in the United States. Each uses, on average, 76 W of power and is turned on for 6.3 hours a day. If electrical energy costs 0.089 dollars per kWh, how much money is spent every day in keeping the TVs turned on? Number Units

And finally we can convert this into money like this:

So they spent every day approximately in total $ 4815291.6 dollars

Step-by-step explanation:

For this case we can convert the average power into Kw like this:

Now on average we know that one person use on average this power over 6.3 hours per day so then we have the following consumption rate:

And now we know the total population so then the total consumption per day would be:

And finally we can convert this into money like this:

So they spent every day approximately in total $ 4815291.6 dollars

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