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Search Results for: Jana Russick

How Does Adding and Subtracting Decimals Work?

adding and subtracting decimals: girl reading a book on her belly

Adding and subtracting decimals is actually very similar to the addition and subtraction of whole numbers, which don’t have decimals. However, seeing all those numbers to the right of the decimal point can be intimidating and makes a problem seem much harder than it actually is.

In this guide, we'll show you just how simple it is to add and subtract decimals.

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What Is the Average Rate of Change, and How Do You Find It?

average rate of change: girl doing her homework

Average rate of change is the rate at which one value within a function changes in relationship to another. The average rate of change is usually used to determine the slope of a graphed function.

Let's explore how to find the average rate of change and use linear and nonlinear functions to demonstrate it.

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How to Find Rectangular Prism Volume and Surface Area

rectangular prism volume: Two colorful blocks stacked on top of each other

How do you determine rectangular prism volume and surface area? Let's start by defining what this shape is.

A rectangular prism is a three-dimensional shape with two identical rectangular faces and one identical square face:

rectangular prism volume: Rectangular prism

Other examples of prisms include triangular prisms, square prisms, and polygon prisms:

rectangular prism volume: Examples of polygon prisms

Let's learn how to find the surface area and volume of a rectangular prism.

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What's the Difference Between Expressions and Equations?

expressions and equations: girl solving a math problem

Expressions and equations are terms you've probably heard in real-life, most often in a high school math class. But do you know the real difference? They both can have numbers and variables, but there’s one key difference. Let's explore what this is and show you how to simplify and evaluate expressions and equations.

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2 Formula for Finding the Area of a Rhombus

area of a rhombus: rhombus

Image credit: Desmos

Trying to find the area of a rhombus can be simple. Here, we’ll look at the two formulas for the area that don’t use trigonometry so you can find your answer without too many headaches.

You can use one of these two formulas to find the area of a rhombus:

area of a rhombus formula 1

In this formula, h is the length of the height and s is the length of any side.

area of a rhombus formula 2

Here, p and q are the lengths of your two diagonals.

Before we show you how to use these formulas, let's explain what a rhombus is.

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