Exam Maths Puzzle Time Distance and Speed

A field bordering a straight stream is to be inclosed. The side bordering the stream is not to be fenced. If 1000yards of fencing material is to be used, what are the dimensions of the largest rectangle field that can be fenced What is the maximum area?

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How do I check the solution for 7m+8=71 A baseball is hit by a batter. The function
s(t) = -16t to the second power + 140t + 3
models the ball's height above the ground, s(t) in feet t seconds after it was hit. How long will it take for the ball to strike the ground? Round to the nearest tenth of a second.