In my free time, I like to travel, play basketball, and working out. What is the problem with the sentence above?
The sentence above does not have complete parallel structure. The tense of travel, play, and working are not the same. The sentence can be fixed by changing working to work.
What is the volume of the cube with side length 3?
The volume of the cube with side length 3 is 27. The volume of a cube is calculated by raising the side length to the third power since the length, width, height of the cube are all 3.
What is the derivative of (1/2)x^2 + 9x + 16 with respect to x?
The derivative of (1/2)x^2 + 9x + 16 with respect to x is x + 9. Use the power rule for (1/2)x^2 and the derivative of 9x is simply 9 because the derivative of x is 1.