decline agricola bonus please.

Answer 1

agricola will have all first declension endings. Almost all first-declension nouns are feminine, but this is the primary exception.

Because agricola is masculine, any adjective that modifies it needs to be masculine also. bonus will have second-declension endings to modify this masculine noun.

First declension endings, singular:
a
ae
ae
am
a (with ¯ over the a to denote long a)

First declension endings, plural:
ae
arum (long a)
is (long i)
as (long a)
is (long i)

Second declension endings, singular:
us
i
o
um
o

Second declension endings, plural:
i
orum
is
os
is

This chart should be helpful:
http://www.slu.edu/colleges/AS/languages/classical/latin/tchmat/grammar/decl-c.html

Answer 2

Be sure to note the long vowels that show up clearly in the chart.