A student came late to class and started her notes midway through the lecture. These are the notes she copied: -Small, rocky object --Not round, irregular shapes -Several meters to kilometers -Make up a belt between Mars and Jupiter What should she title her notes? Comets Asteroids Meteors O Meteoroids​

Asteroids  

Explanation:

This is a matter of knowing the definitions. Although the biggest hint is "Make up a belt between Mars and Jupiter" which should cause you to immediately think "Asteroid Belt". But let's look at the options and see what fits.  

Comets - Mostly comprised of ice and dust. They're not "rocky", so this isn't a good choice.  

Asteroids - Nothing the lecture describes conflicts with what an asteroid is, so this is the correct choice.  

Meteor - Key thing here is a meteor is that a meteor is a small body that's burning up in the Earth's atmosphere, causing a streak of light. And that's not what the lecture is describing, so this is a bad choice.  

Meteoroids - This is a body orbiting the sun, that will in the future become a meteor. And that's not something in a stable orbit between Mars and Jupiter. So this is also a bad choice.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

b: the exchange of coined money