exam Maths Puzzle Numerical Ability

find vertex and intercept coordinates of the following
a=b^2-6b-16

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exam Other Question

2x + y - z = -5
x - 3y + 2z = 5
2x + 4y - 2z = -8

solve the following system of equations in three variables a magnetic head has worn down to the chord line ab measuring 0.250 inches. if the original gap dept is 0.125 inches, how much useful head life remains? (hint : first solve for the