Today is the first time in a decade that I actually wished I was back in school. Mathpix is an iOS app that can recognize and answer handwritten math equations in seconds. Open the app, point the camera toward your math problem (you'll need legible handwriting, or it won't work properly), and it'll give you the correct answer along with step-by-step directions to reach the solution. Mathpix even works with more complex equations that require graphs or charts. The app works by sending the equation to a server, so you'll need a connection to use it.
All kidding aside, Leah Nixon of Rapid City and her sister, Grace Nixon Peterson, now living in Florida, indeed belong to the generation which can tap out a text faster with two thumbs than most can type with 10 fingers. But you're just as likely to catch them applying a postage stamp to an envelope with a handwritten letter or card and dropping it into a mailbox.