When conducting a cluster sample, is it better to have fewer clusters with more individuals when the clusters are heterogeneous?

The following graph shows the consumer price index (cpi) for a fictional country from 1970 to 1980? a.) 1976 - 1978b.) 1972 - 1974c.) 1974 - 1976d.) 1978 - 1980

Let f(x) = x+3 and g(x) = 1/x the graph of (fog)(x) is shown below what is the range of (fog)(x)?

Polynomial that can be factored as (3x-4)(3x+4)