Answer:
Complementary angles.
Step-by-step explanation:
Notice that
and
, by given.
, by sum of angles.
, by supplementary angles definition.

Which means,

Therefore,
, in other words, angles a and b are complementary by definition.
240 inches will be the correct answer.
Answer:
B
Step-by-step explanation:
Answer:
76800
Step-by-step explanation:
Current subscriber=4800
After 3 years=2*4800=9600
After 6 years=2*9600=19200
After 9 years=2*19200=38400
After 12 years=2*38400=76800
19 or 19/1
Hope this helped!