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# Hi, I need help with question 5a and 5b please

5 . The cost, in hundreds of dollars, of manufacturing x cases of flash drives is
(6)
C(x) =-0.2x2 +8x-40, for OSX\$ 20.
5a. Find the average rate of change of cost as x changes from x = 5 to x = 10. Be sure
b = 10
F ( b ) - f (a) yes.
1.
4
9 ) = 41
f ( 6 ) = 60
.2 ( 10 ) 78 ( 10) 40
= 20
10
20 + 5 .
b - a
\$ 380
-: 2 (5 ) +8 (5 )- yo f ( 10 ) = 20
10 - 5
per
( 12 )
= 5
10 -5
\$50O per flash drive case
flash
5b. The instantaneous rate of change of cost is also called marginal cost. Find the
drive
marginal cost of making x = 5 cases of flash drives. Use the limit definition! And
cases
\$ 1980 / flash drive f( 5th ) - f(5 )
cases
Stw ( sth )
25+ Sht sht h z
2 5 + loh th 2
- o 2 ( 2 5 + 10 h+ h ? ). + 8 (sith ) - 40 - 2(5)2+8(5)-40 9
- 5+ zh Izh ? + 40* 8K-40
h. ( 10h + 2/ 2 )
IK (D+ 2 h )
K ,

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