l/

l)

r(x)-(-ll3)x3+

(llil)xz*6x*8

->

r'(x)=-x2

*x*6

I

I a)x=3

b)21.5

c)Shown"(3)<0

I

2)

4

f

(x)=3x2

-l2x+9

b)

f'(x)

=6x-12

c)

Max

Pt

(f,4),

show

f'(1)

<

0

Min

Pt

(3r8),

show

f'

(3)

>

0

d)

Inllection

Pt

(2,-6)

,

e)

Use

Your

TI-83

with

giien

window

.....,.-,'',

3)

a)

-36

b)

r=2

c)128

4)

r44

5)

a)

(1/2;erdk+1)+

C

or

(1/2)(2x+1)

+

C

c)

(1/3)In

1x3+

9x+7;+

C

d)

G3/7)"(s-7r)

. x2

*x#C

6,

13,D,A30,000

or

131203X10e

or

1'31203Billion

7)

a)

$4,7L2

b)

-$1,513.50

8) $4,417