125,594 miles. Canada coastline (x) - U.S. Coastline (12,383) = 113,211.
x - 12,383 = 113,211
x - 12,383 + 12,383 = 113,211 + 12,383 (by addition property of equality)
x = 113,211 + 12,383
x = 125,594
Basically, you add the two given numbers together.
X^2 x 8x -3x^2 +5 x 8x -5 x 3
8x^3 -3x^2 +40x -15
Here is the answer to your question as This is the way I think it is solved
f(x) = -14 - 4(5 - 3x)
distribute the -4 to the whole parentheses
-4 × 5 = -20
-4 × -3x = 12x
f(x) = -14 -20 + 12x
subtract 14 from -20
f(x) = -34 + 12x
There you go! I really hope this helped, if there's anything just let me know! :)
