The monthly salary S( t ) in dollars for a dock worker shown above has the following cubic model.
S
(
t
)
=
0.182
t
3
−
7.55
t
2
+
101.2
t
+
990
\displaystyle {S}{\left({t}\right)}={0.182}{t}^{{3}}-{7.55}{t}^{{2}}+{101.2}{t}+{990}
S
(
t
)
=
0.182
t
3
−
7.55
t
2
+
101.2
t
+
990
where t is the number of years after 1980
Interpret S( 1998 ) = 1426.82
The salary in 1998 was 1426.82.
The monthly salary in 1998 was $1426.82.
The monthly salary in 1998 was 1426.82.
Interpret
S
′
(
1998
)
=
6.3
\displaystyle {S}'{\left({1998}\right)}={6.3}
S
′
(
1998
)
=
6.3
The monthly salary in 1998 was neither increasing nor decreasing.
The monthly salary in 1998 was decreasing by 6.3 per year.
The monthly salary in 1998 was increasing by 6.3.
The monthly salary in 1998 was increasing by 6.3 per year.
The monthly salary in 1998 was decreasing by $6.3 per year.
The monthly salary in 1998 was increasing by $6.3 per year.
The monthly salary in 1998 was decreasing by 6.3.
Submit
Try a similar question
License
[more..]