Exam Maths Puzzle Age Problem

I am in year 7 and I have a question. Could you please explain the term Linear Equation. I have looked on the internet, but the explanations are too complicated, could you please explain it to me so it can make more sense. Thank You, Ryan aged 12

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Exam Other Question

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. Simplify log 1/64 (Base 4)