Answer:
See below
Step-by-step explanation:
The 'mean' is the three numbers added together
then this sum is divided by 3
(5 + 7 + 9 )/3 = 21/3 = 7
m∠TUW = 90, m∠VUR = 130, m∠VUW = 50
Supplementary angles add up to 180!