Identify the points at which f(x) is differentiable. f(x) = |x + 3|; (-6, 3)
A.
f(x) is differentiable at x = 3.
B.
f(x) is differentiable at x = -3.
C.
f(x) is differentiable everywhere except at x = 3.
D.
f(x) is differentiable everywhere except at x = - 3.

30,40,50 is correct answer

step-by-step explanation:

total income = price of one ticket   *   number of tickets sold

  y                 =     4                                   x

so the equation is y=4x     with x≥0   because number of tickets sold can not be negative

thus the equation is a semi -line with an end point at

(0,0)

passing through :

x=1     y=4(1) = 4   so through (1,4)

1/4 is the answer if i recall correctly.