To enter a piecewise function with three equations into Mathway, you can follow these steps:1. Open Mathway on your device or visit their website.2. Select the "Functions" category or search for "Piecewise Functions" in the search bar.3. Choose the option that allows you to enter multiple equations.4. Enter the different equations for each interval, specifying the conditions for each equation.5. Make sure to use the appropriate syntax and symbols to represent the conditions and equations accurately.6. Once you have entered all the equations, you can submit the function and Mathway will provide you with the solution or graph.Remember to double-check your input to ensure accuracy before submitting the function.

You can graph with Desmos . Here's an example: https://www.desmos.com/calculator/xrfmngtyoi . The syntax for defining a piecewise function should be clear from the example above, but to be explicit: f(x) = {[condition 1 on x]: [expression 1], [condition 2 on x]: [expression 2]}. The absolute value function over the reals would then be f(x) = {x >= 0: x, x < 0: -x} After defining your piecewise functions, plot the composition by adding the equation of that graph, i.e., if you've defined f and g, add the equation y = f(g(x)) or y = g(f(x)) to see the composition.