exam Maths Puzzle Numerical Ability

Find the axis of symmetry.
y = x^2 + 7x + 4

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exam Other Question

The distance a car can travel on a certain amount of fuel varies inversely with its speed. If a car traveling 50 mph can travel 300 miles on 10 gallons of fuel, how far could the car travel on 10 gallons of fuel at 60 mph?

Thank you 4x+3y=-22
x-3y=2