Start a formula with an equal sign.
Click on a cell to include the cell's value in your formula.
Use dollar signs when referring to a single cell that isn't part of a column of values.
To apply formula to entire column, put cursor on lower right corner and drag down.
Naming Cells
If you name a cell, you can use the name in a formula, which makes it more readable.
Right click a cell, choose define name, and then edit if needed in the dialog box.
Excel will look for text next to the cell for a name, but you can add your own.
Sometimes it makes you put an underscore before a single letter, like '_m'
Scatter plots and Trendline Functions
Highlight the data you want to plot such that the x-values are on the left.
In the Insert tab, select charts and click on Scatter (X,Y).
Choose the graph with data points only - no lines between the points.
Always label your chart axes, including units:
Click on the graph and then the "+" symbol and check the label boxes.
Adding a trendline and getting equation:
Right click on a data point, choose "add trendline".
Choose between a linear or other type of fit. Check "display equation on chart."
Plotting multiple data sets on one chart.
Right click on a data point, choose 'Select Data', then add a new data series.
Select X and Y data for the new series.
Make sure to erase what's in the 'Y values' box.