Question

Need help please thanks

Answer 1

a)

`y = 7( {1.03}^(t) )`

`y = 7( {1.03}^(5) ) = 8.11`

There were about 8.11 billion subscribers in 2019.

b)

`7( {1.03}^(t)) = 7.5`

`t = 2.33 \: years \: after \: 2014`

sometime in 2016