exam Maths Puzzle Numerical Ability

What does a equal is this parabolic equation?

Y= a(x-315)�+630

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exam Other Question

A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on 1-hour flight is 0.02. What is the probability that both will fail, neither will fail or one or the other will fail? Graph the line y=3x-2. Label the x-intercept and y-intercept