My wife, a math teacher, has some ideas for math-related iPhone / iPad apps. Among other things, i'm a front-end developer. I know HTML/CSS/JS and backend PHP, etc. I wanted to ask what the most straightforward method is for someone like me to build a relatively straightforward app (i.e. not a game, etc.) - an app that Apple won't reject because of how it was made. I've seen jQuery mobile and PhoneGap... are these really good options? What else is out there? Hopefully this makes sense!