Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer. 

Yes, dandelions are considered perennial, broadleaf weeds.

Yes, if your home is poorly maintained and has weeds and overgrowth, it can affect your home appraisal and lower the value. Home buyers want to see a well-kept home, and if yours lacks curb appeal whether inundated by weeds or not, you could be neglecting the potential for it to reach its full value.

Glyphosate and other non-selective herbicides can kill orchard grass, but they will also kill the surrounding plants. Also, not all areas allow the use of glyphosate due to its environmental impact—which the EPA describes as a "potential risk to terrestrial and aquatic plants and birds, and low toxicity to honeybees." Consider mechanical removal to target the plants specifically.