9D

Algebra is all about using letters (variables) to represent unknown numbers. This lets you write down mathematical relationships and solve for the values you don't know.

It's important to know the difference:

Geometry is the study of shapes, sizes, positions, and properties of figures. Measurement is how we put a number to those properties. You'll primarily focus on 2D shapes (flat figures) and 3D objects (solids).

Computers use binary (base 2) because their circuits are either on or off, representing 1 or 0. Humans are used to denary (base 10), using digits 0-9. Hexadecimal (base 16) is a compact way to represent binary, using digits 0-9 and letters A-F.

Binary to Denary:
Each digit in a binary number represents a power of 2, starting from 2^0 on the far right. You multiply each binary digit by its corresponding power of 2 and add the results.

Functions are blocks of organized, reusable code that perform a single, related action. They make your code more modular, readable, and easier to debug.

To define a function, you typically use a keyword (like def in Python) followed by the function's name, parentheses for parameters, and then a colon. The code inside the function is indented.

When we talk about statistics and probability, we're essentially dealing with data and the likelihood of things happening.