How hot and how bright?

This task is about reading a graph about brightness and temperature of stars.
graph of luminosity and temperature for stars

Question 1Change answer

a)  Which star type has a temperature of 5000°C and a luminosity (brightness) of 70,000? 

Question 1Change answer

b)  Write in the temperature and luminosity for "Supergiants".
Luminosity:  
Temperature: °C

Question 2Change answer

c)  On the graph luminosity is compared with our Sun. What does a luminosity of 1000 mean?