Suppose you own a car that is 40 months old. From an automobile dealer's "Blue Book" you find that its trade-in value is $3200. From an old Blue Book you find

that its trade-in value 10 months ago was $4700.

a. Write a function expressing trade-in value as a function of the cars age in

months.

b. You plan to get rid of the car when its trade-in value drops to $1000. How

much longer should you keep the car?

c. What does the slope of your function represent in the real world? Why is

it negative?

d. When do you predict that car will be worthless? How do you know this?

e. According to your model, what was the trade-in value of the car when it

was new?

the answer to the question is a

step-by-step explanation:

it has the same slope and the same y-intercept.

y + 11 = -7/9(x - 18)

y + 11 =-7/9x + 14

b

y = -7/9x + 3

y-intercept (0, 3)

4 puzzles in 3 hours

step-by-step explanation:

step-by-step explanation:

f(x)=2x^2 -1 

translation is a function transformation that transform the function in a way of translating. by translating the function its graph is moved  up an down. moving the function f(x) 2 units to the left will be the new function g(x) with the equation: g(x)=f(x+2)=2(x+2)^2 -1

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional