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?
+
Math question: What is the 4th derivative of f(x) = cos(x) + 2x^3 - 5x^2 + 9x - 7?
+
What is the sine of an angle in a right triangle if the opposite side is 5 and the hypotenuse is 13?