Two function f and g are defined on the set R of real numbers by : f:x = x² - 2x - 1 , g:x = x - 1​

b

step-by-step explanation:

the word superfluous means unnecessary

i believe b is the answer

arc length = radius * x ( in radians)

6 * pi = 18 * x

divide by 18 on each side

6 pi / 18 = x

pi/3 = x

the angle is pi / 3 radians

or   60 degrees

assuming "divided his salary into two" means in half,

he has 215 remaining, plus 200 he originally had before buying a watch

he originally has $415 in his personal account

if this is half the salary, 415 times 2 is $830

his salary would have been $830.