Question

The graph above shows the stock price of company XYZ over a one week period. Use this information to answer the following questions. You should click on the "Get Larger Graph" to get a larger image. All of the prices are whole numbers. Furthermore, either all of the prices are even numbers or all of the prices are odd numbers (depending upon which version of the problem is yours).

(a) What is the change in the stock price for the week (between Monday and Friday)? $

(b) Find the average rate of change in the stock price for the later half of the week (between Wednesday and Friday). $_____ per day

(c) If this average rate of change continues, how many more trading days until the stock price reaches 4? ______ days.

Answer 1

@dan815

Answer 2

@ganeshie8

Answer 3

Looks pretty straightforward
how are you stuck on this ?

Answer 4

Look at the graph
what is the approximate stock price on Monday ?

Answer 5

27 roughly

Answer 6

Yes,
what is the approximate stock price on Friday ?

Answer 7

25

Answer 8

GOod.

Monday : 27
Friday : 25

whats the change ?

Answer 9

im pretty sure i have the first one, its the second and third one

Answer 10

2

Answer 11

2 is wrong

Answer 12

think again, has the price increased / decreased ?

Answer 13

increased

Answer 14

are you sure ?

Answer 15

decreased sorry

Answer 16

change between monday and friday = 25 - 27 = ?

Answer 17

-2

Answer 18

Yes, therefore the change is "-2"

not "+2" ok

Answer 19

"negative" sign tells us that the price has "decreased"

Answer 20

okay

Answer 21

lets look at part b

Answer 22

(b) Find the average rate of change in the stock price for the later half of the week (between Wednesday and Friday). $_____ per day

Answer 23

Look at the graph again

stock price on Wednesday = ?
stock price on Friday = ?

Answer 24

31 or 32 for Wednesday
25 for friday

Answer 25

31 for Wednesday looks good

Answer 26

how many days are there between Wednesday and Friday, inclusive ?

Answer 27

Wednesday, Thursday, Friday.

3 days

Answer 28

So the stock price has decreased from 31 to 25 in 3 days, yes ?

Answer 29

okay and yes

Answer 30

average rate of change = (change)/time
= ?

Answer 31

change = 25 - 31 = ?

Answer 32

oh okay that makes sense

Answer 33

so is it 3?

Answer 34

Nope

Answer 35

?

Answer 36

2?

Answer 37

average rate of change = (change)/time
= (25 - 31)/3
= -6/3
= -2

Answer 38

careful with signs ok

Answer 39

change = final - initial

Answer 40

ok

Answer 41

That means, the stock price is falling at a rate of 2 dollars per day between wednesday and friday

Answer 42

that makes sense

Answer 43

answer for part b is "-2" ok

Answer 44

"-2" represents "falling by 2"

Answer 45

okay and what about for part c

Answer 46

(c) If this average rate of change continues, how many more trading days until the stock price reaches 4? ______ days.

Answer 47

whats the price on friday ?

Answer 48

25

Answer 49

and you want the stock price to reduce to 4

Answer 50

thats a change of 4-25 = 21

Answer 51

we're assuming that the stock price reduces by 2 dollars each day

Answer 52

thereofre number of days required is 21/2 = ?

Answer 53

it said whole numbers

Answer 54

enter 11 maybe

Answer 55

ok

Answer 56

b and c are wrong

Answer 57

oh how many more attempts do u have ?

Answer 58

9

Answer 59

try this

b) -3
c) 7

Answer 60

perfect thank you