Step-by-step explanation:
We have AB = 7, Angle ABC = 70°
and Angle ACB = 90°.
Angle BAC = 180° - 70° - 90° = 20°
(Sum of angles in a triangle = 180°)
Using Trignometry,
AC = 7sin70° = 6.58.
BC = 7cos70° = 2.39.
Since the function f(x) is written in the form y = mx + b, where m is the slope and b is the y-intercept, it currently has a y-intercept of b = 6. If this function is shifted downwards (vertically) by 12 units, its new y-intercept will be:
If the lenght of a circle circumference is given by:

So the lenght of a semicircle circumference is given by the half of it:

Radius (R) = 12 ft

Answer = 12pi ft of fence.
factor out the x+1 from the numerator and denominator to get 
denominator: x³ - x = x(x² - 1) x(x-1)(x+1)
Answer: J