exam Maths Puzzle Numerical Ability

Television sets: What does it mean to refer to a 20 inch tv set or a 25 inch tv set? Such units refer to the diagonal of the screen. A 20 in set has a width of 16 inches what is the height?
What is the height of a 20 inch TV? _____inches

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exam Other Question

Solve.

If a 4.4-pound bag of dog food costs $3.52, what is the cost per pound? The height h in feet of an object after t seconds is given by the function
h = -16t^2 + 30t + 3.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

I wish that I knew how to do this problem!