Perri's Unit Review

Completing the Square

200

x²-14x+16=0

x=12.74 , x=1.26

400

12x²-24x-36=0

x=25.30 , x=-1.30

600

2x²+14x+24=0

x=-4.76 , x=-9.23

Growth and Decay

200

Find a bank account balance if the account starts with $100, has an annual rate of 4%, and the money left in the account for 12 years. 

$160.10

400

,ikThe population of Winnemucca,Nevada, can be modeled by P=6191(1.04) where t is the number of years since 1990. By what percent did the population increase each years ?

4%

600

Each year the local country club sponsors a tennis tournament.Play starts with 128 participants. During each round,half of the players are eliminated. How many players remain after 5 rounds ?

4 Player 

L,E,Q,models

200

y=x²-2x-3

y=-4

(1,-4)

400

y=x²-2x+4

y=x-1

(1.2,0.2)

600

-4x+y=6

-5x-y=21

(-3,-6)

Square root Function

200

y=the square root of x-9

(9,0)

400

y=the square root of x+7

(-7,0)

600

y=the square root of x+5

(-5,0)

Substitution

200

y=6x-11

-2x-3y=-7

(2,1)

400

y=-3x+5

5x-4y=-3

(1,2)

600

2x-3y=-1

y=x-1

(4,3)