If f
(
9
)
=
2
,
f
′
(
9
)
=
–
1
,
g
(
9
)
=
–
9
,
and g
′
(
9
)
=
5
,
what is h
′
(
9
)
?

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?