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To create a line graph in Microsoft Excel 2013, use the mouse to highlight the data you want to include in the graph, and select the desired type of line graph from the Insert tab. Be sure to highlight the headings of rows and columns of the data table.


To find the equation of a line that is tangent to a curve, you must find a line with the same slope as that point of the curve. This can be done with a graphing calculator that can give the slope at a particular point or by hand using the derivative of a curve function.


Find the equation of a circle using the formula (x-h)squared+(y-k)squared=r squared. Know that h and k represent the coordinates for the center, with h being the x value, k being the y value and r being the radius.


The chemical equation formula for water is expressed as H2O, but also is acceptable when displayed as HOH. In this equation, two hydrogen atoms react with an oxygen atom to form a single molecule of H2O.


It is warm near the equator because the sun is more directly overhead rather than at an angle like it is at the poles. The areas that are hit by the rays of the sun are greater at the equator than at higher latitudes.


Density is calculated by dividing mass by volume. As density measurements are commonly reported in grams per cubic centimeter, conversion is required when the mass or volume of a material is measured using other units.


The equation for measuring apparent weight is F = mg + ma. F represents apparent weight in newtons, m is the mass of the object, g is the acceleration due to gravity (9.8 meters per second squared on Earth's surface) and a is the acceleration of the object.


In Excel, the mean function is used to calculate the average of a set of numbers. The numbers used can come from any cell in an Excel spreadsheet by listing the cells involved into the average function box.


An inverse equation, or inverse function, is an equation that reverses another equation. If an equation will give the value of y when providing x, the inverse equation will give the value of x when providing y.


Find the equation for the tangent line to a curve by finding the derivative of the equation for the curve, then using that equation to find the slope of the tangent line at a given point. Finding the equation for the tangent line requires a knowledge of calculus and the formula for the slope.