Find the center, radius, and interval of convergence of power series of N=0 to infinity

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Aportion of a hiking trail slopes downward at about an 84° angle. to the nearest tenth of a flot, what is the value of x, the distance the hiker traveled along the path, if he has traveled a horizontal distance of 120 feet? a. 143.3 b. 12.5 c. 120.7 d. 130.2

Is this a polynomial function? i need to know asap