exam Maths Puzzle Numerical Ability

Determine the equation of the parabola with vertex (-2,5) and that passes through (4,-8)

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exam Other Question

Using the Gauss-Jordan elimination on the following linear system, what would the augmented matrix be?

3w-x=2y+z-4
9x-y+z=10
4w+3y-z=7
12x+17=2y-z+6

The way I have tried t test scores are 80 96 78 87 what does 5th test score need to be to have average of 84...how to figure this out?