sue's tyre pressure gauge shows a reading which is 8 percent higher than the actual pressure. What is the actual pressure when sue's gauge shows 39.42?

36.5

Step-by-step explanation:

39.42=(100%+8%)=108%

x=100%

39.42/x = 108/100

x=39.42*100/108

x=36,5

actual pressure will be 36,5

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

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step-by-step explanation:

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