exam Maths Puzzle Numerical Ability

The height h in feet of an object after t seconds is given by the function
h = -16t^2 + 40t + 10.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth

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exam Other Question

angle BFA and angle DFE are vertical angles. If angle BFA=3r+12 and the measure of angle DFE=-8r+210, what is the measure of angle AFE? In an election, it was estimated that person A would receive 200 of the 300 electoral votes. What was the standard error? This question is due on day 6.