exam Maths Puzzle Numerical Ability

What is the range of the function y=2(7)^(2x)-4??? I think it is y is less than -4?????????????

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exam Other Question

The height ,h, in metres reached by a ball thrown into the air t seconds is given by the formula h=80+49t-4.9t^2. How long does it take the ball to reach its maximum height ? A rod of 5 m at 6c grows to 5.006 m when the temperature is raised to 48c. Find the coeffcient of volumetric expansion of the unknown composing the rod.