:iagree:
That sounds like a nice combo. I have Jacob's Alg here on my shelf but it doesn't appeal to me. Lots of words on the page. I do like MUS for algebra since it teaches conceptually, has minimal clutter on a page, has an optional video (which dd9 enjoys), and complete solutions. I happen to use MUS alg w/ other alg resources so it isn't a stand-alone for us.
Here is dd working on some MUS alg problems from last week. Many of my math-related blog posts illustrate the various math methods I use. MUS blocks may be just what your dd needs for math to come alive. If anything, it's a nice change of scenery.
You are blessed that a df gave you the blocks. Check out Steve Demme's alg demo on youtube so you can see what's coming down the pike.
HTH! :)