(1) In the Mathematics for electronics section: (2) In the "Logarithms for analog circuits link." (3) In Question 1: "Reveal answer" in the far right of the box you have "LOG10 1000 = 3" going off the right side of the page. It should say LOG1000 = 3 Also the question right above the answer box is also worded incorrectly. it reads: 10- 3rd power = 1000 (powers and logs are inverse functions) LOG10 = ??? = ??? Should read (powers and logs are inverse functions) LOG1000 = ??? This is in accord with Question #4. Also you might want to move "Logarithms for analog circuits" to the third spot in the Mathematics for electronics section since there is Logarithmic questions in previous sections without any introductory teaching on the subject.