Add Yahoo as a preferred source to see more of our stories on Google. Sorry, it’s math time. But these are some of the easiest math quizzes we’ve ever put on ...

(NEXSTAR) — Are you smarter than a Texas fifth-grader taking the STAAR Test? As another new school year begins, it’s never a bad idea to know what the kids are learning — or how hard the lessons are.

If you rotate something with transform matrix A, then by B, the combined transform is BA, isn't it?<P>I'm sure that's right, but I'm figuring out some coordinate frame transforms, & I get the reverse ...