Answer:
3
Step-by-step explanation:
Whatever number you put between the | | will always come out as positive because of the absolute rule.

Since she has seven key the probability that the first one will open the door is

if it takes three attempts to open the door,the probability is

if the three attempts would not work
then the probability that the fourth attempt will open the door is

hope this helps
The correct answer is:
2u-v=7(5i-3j)
Therefore, 5, and 3 go inside the box.
Look at the back for answers ( my workbook has answers)
Domain: all real numbers
Range: y<0