State why telescopes that detect non-optical radiation are useful for studying objects in space.

Because radiation goes a long way. Radiation itself isn't visable but if it's from a nearby star you'll be able to see the star. Radiation keeps moving outwards forever. Things that can sense radiation that you can't see will help you have an idea how far away the source of that radiation is from

Because some objects emit radiation that only an x-ray telescope would show,something that an optical one wouldn't pick up in space

320 has the same value as 32 tens, you can find this by taking 32*10=320

Hope this helps!=)