19. How many solutions does the equation -2(x + 4) = 2(x + 4) - 6 have?

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

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

Indicate the formula for the following conditions: p^c(n,r)=