Number 10: what is 18.9 to the 4th power? round off to the nearest decimal.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.