Comprehensive Guide to Key Mathematical Concepts and Skills

What is the square root of $81$?

Which expression correctly uses index laws for $a^3 \times a^4$?

If you convert the decimal $0.75$ to a fraction, what is the correct fraction?

An equilateral triangle has three equal sides and three equal angles.

To find the area of a rectangle, multiply its length by its perimeter.

In probability, the sample space includes all possible outcomes of an experiment.