Question

STOCKS The Dow Jones Industrial Average Index is an index that tracks the performance on the New York Stock Exchange of 30 of the largest companies in the United States. The table below shows the change in the DJIA on a given trading day. Write an expression to show the change in value of the Average during the day.


Time: Change (dollars)
10:00. +3.00
12:00. -5.00
2:00. -2.00
4:00. +6.00


a. Write an expression to show the change in value of the Average during the day.



b. The Average closed the day before at 10,812. What was the index at noon?


c. By the end of the day, did the Average gain or lose value? Explain your reasoning.

Answer 1

#A

$\\ \sf\longmapsto +3.00-5.00-2.00+6.00$

Total trading:-

$\\ \sf\longmapsto +2.00$

#B

• Closing=10,812

Trading at noon=

$\\ \sf\longmapsto 10812-(-2.00+6.00)$

$\\ \sf\longmapsto 10812-4.00$

$\\ \sf\longmapsto 10808$

#C

There is average gain of +2.00(Check solution of A)

Answer 2

Answer:

Objective a:

$average \: change = 3.00 - 5.00 - 2.00 + 6.00\\ \\ = 2.00\\ \\ = 2.00$

Objective b:

${ \rm{ = 10812 - ( ^{ + }3.00 - 5.00) }} \\ \\ = { \rm{10814}}$

Objective c:

It gained, because there is an increase in positive change in every two hours.