David spent 1/3 of his money on books. he spent another 1/6 of it on stationery and $50 on a radio. if he had $100 left, how much money did he have at first

You have to work backwards here

so if you had 100 dollars left and u spent 50 on a radio

100+50=150

Then You spent a 1/6 of it on stationery

So you mustve had 5/6 money left or 150 dollars

so you multiply that to find that

5/6=150/x

5x=900

x=180

so add 30 dolalrs to 150 and you have 180.

the you spent a third

you repeat the same process

the you have ur ANSWER

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

step-by-step explanation:

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