What years does the U. S. federal government us as the base year to calculate CPI?

Currently, the reference base for most CPI indexes is 1982- 84=100 but some indexes have other references bases. The reference base years refer to the period in which the index is set to 100.0. In addition, expenditure weights are updated every two years to keep the CPI current with changing consumer preferences.

step-by-step explanation:

107 units

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2