A contour map for a function
f
\displaystyle {f}
f
is shown. Estimate the value of
f
(
1
,
9
)
\displaystyle {f{{\left({1},{9}\right)}}}
f
(
1
,
9
)
1
2
3
4
5
10
20
30
50
100
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250
f
(
1
,
9
)
≈
\displaystyle {f{{\left({1},{9}\right)}}}\approx
f
(
1
,
9
)
≈
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