Determine all numbers at which the function is continuous.
x+ + 5x - 36
f(x) = x + 8x-9
13
if x-9
if x=-9
10
a.
continuous at every real number except x = 1 and x = -9
b. continuous at every real number except x = -9
continuous at every real number except x = 1
d. continuous at every real number except x = -9 and x = 4
c.