exam Maths Puzzle Numerical Ability

How can I find the vertex while using the quadratic formula?

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exam Other Question

Find the slope of the line that passes throught the points (-3,-6)and (1,6). Used by itself, the cold water faucet can fill a bathtub in 12 minutes. It takes 15 minutes for the hot water faucet to fill the bathtub. If both faucets are on, how long will it take to fill the bathtub?(round to the nearest .01 minute)