What number has four significant figures?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?