Question

number of mobile - phone subscriptions
worldwide (2009 - 2018)
global population
mobile subscriptions
this graph shows how mobile - phone subscriptions
have changed over time.
according to the graph, the number of mobile
subscriptions has since 2009.
the number of mo
stayed the same
doubled
tripled
people in the
world.

Explanation:

Step1: Analyze the graph trend

Observe the orange line (mobile subscriptions) from 2009 to 2018. In 2009, the value is around 4.5 billion. In 2018, it's around 8.2 billion.

Step2: Calculate the approximate multiple

\(\frac{8.2}{4.5}\approx1.82\), which is close to double (a multiple of 2).

Answer:

doubled