Articles

A 365-day year has 31,536,000 seconds, but a Julian year has 31,557,600. Learn the conversion chain and which year length to use.

Divide 235.215 by US mpg to get L/100km. Learn the formula both ways, the UK gallon trap, km/L, and why the MPG illusion misleads car buyers.

One knot is one nautical mile per hour, or 1.150779 mph. Learn where the knot comes from, why sailors and pilots use it, and how to convert it fast.

A poll of 1,000 people carries a margin of about 3 points. Learn what that means, why a lead needs double the margin, and how to read polls.

Hypothesis testing works like a trial: assume no effect, then reject it only with strong evidence. Learn the logic, errors, power, and real uses.

A p-value measures how surprising your data would be if the null hypothesis were true. Learn what it means, what it does not, and the top myths.

A logarithm answers one question: what power do I need? Learn the log rules, why they work, and how log scales measure sound, acidity, and quakes.

Learn to read functions and graphs in real life: what f(3) = 7 means, how to spot rate of change and intercepts, and which shape fits each situation.

Solve inequalities step by step: linear, compound, absolute value, and quadratic types, plus real budget, grade, and weight limit examples.

Learn what makes an equation linear, why it graphs as a straight line, its three possible outcomes, and how to turn real word problems into one.