Thanks for responding!
Here are the answers if you want to double-check you got them right:
1. If you measure the voltage over each of the two components – what’s the sum of the two voltages?
The sum of the voltages over the components in a series circuit always equals the applied battery voltage. That means the sum is 9 volts.
2. If you’re told you have 15 mA of current through the resistor – how much current flows through the LED?
The current in a series circuit is equal everywhere in the circuit, since the current has nowhere else to flow. That means the current through the LED is also 15 mA.
If you know someone you think should learn this, you can send them to this article about Kirchhoff’s laws.