Math question: What is the derivative of f(x) = 5x^3 - 2x^2 + 7x - 1?
+
What is the measure of an angle formed when a ray is rotated by 90 degrees in a counterclockwise direction?
+
Math question: Calculate the square root of 25, divide it by 2, subtract 3, multiply by 10, and add the sum to the square root of 16. Round the final result to the nearest whole number.