What is the value of x in the logarithmic function f(x) = log x if f(x) = ln x, where ln represents the natural logarithm?
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What is the vertex form of the parabola function y = -3x^2 + 6x + 4?
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Question: If a car travels at a constant speed of 60 mph for 3 hours and then decreases its speed to 40 mph for the remaining distance, how long does it take to travel 300 miles?