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Mathematics
Problem
Let
f
(
1
)
=
−
2
f(1) = -2
f
(
1
)
=
−
2
and
f
′
(
x
)
≥
4.2
f'(x) \geq 4.2
f
′
(
x
)
≥
4.2
for
1
≤
x
≤
6
1 \leq x \leq 6
1
≤
x
≤
6
. The smallest possible value of
f
(
6
)
f(6)
f
(
6
)
is (a) 9 (b) 12 (c) 15 (d) 19
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