Which could be an equation for the graph?

y = cos(x + 3)
y = –3cos(x)
y = –3sin(x)

How do i do this activity, is appreciated

What is a possible solutions of the x> 3?

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