Step-by-step explanation:
y + 4 = -2x + 2
2x + y = -2
2x = -2 - y
x = -2 -y/2
Use Pythagoras:
x² = (8.5)² + (5)²
x = √[(8.5)² + (5)²]
Answer:
The elevator stops on the 19th floor.
Step-by-step explanation:
On the 16th floor, goes up 12 floors:
16 + 12 = 28
On the 28th floor, goes down 7 floors:
28 - 7 = 21
On the 21st floor, does up 3 floors:
21 + 3 = 24
On the 24th floor, goes down 5 floors:
24 - 5 = 19
n has less than 75 copies
sold 12
so add the 12 back
n had less than 87 copies in the beginning of the day
:)
