Dave owns 15 shares of ABC Mining stock. On Monday, the value of each share rose $2, but on Tuesday the value fell $5. What is the change in the value of Dave's shares?

The change in the value of Dave's shares = $ 105

Step-by-step explanation:

Total number of shares = 15

Let initial value of a share = x

On Monday, the value of each share rose = $ 2

Now the value of each share = x + 2

Total value of 15 shares on Monday = 15 (x + 2) (1)

On Tuesday the value of each share fell = $ 5

Now the value of each share = x - 5

Total value of 15 shares on Tuesday = 15 (x - 5) (2)

The change in the value of Dave's shares = 15 (x + 2) - 15 (x - 5)

⇒ 15 x + 30 - 15 x + 75 = 105

⇒ Thus the change in the value of Dave's shares = $ 105