Just subtract 622 feet from 486 feet to get the change in elevation. The result will be negative because your friend's house is at a lower elevation than yours.
Now find the mean change in elevation per mile by dividing (486 ft - 622 ft) by 4 miles:
-136 ft
----------- = -34 ft/mile
4 mi
Answer:
Step-by-step explanation:
x²+6x+9=(x+3)²
-3x + 5 = 16
First, subtract 5 from both sides.
-3x = 11
Then, divide -3 by both sides.
x = -11/3 or -3.66....
D(t)=25(0.82)^t
d(4)=11.3mg
