Whats the nth term in each of the following sequences. (i) 4, 10, 18, 28, 40

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

I'm confused on this could anyone me and show me what i need to do to solve it.