How do you use AD-AS analysis for following question?

Question

In early 2001 investment spending hsarply declined in the United States. In the 2 months following the September 11, 2001, attacks on the United States, consumption also declined. Use AD-AS analysis to show the two impacts on real GDP.

Answer 1

AD=c+i+g+(x-m)

if investment spending i declines, AD declines, if consumption declines,  also AD declines .

AD curve shift to left.