I DONT KNOW THIS CAUSE ITS TOO HARD ( if says in am in collage I AM NOT i am in Middle school)

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]

Average acceleration: i have no idea how to do this.

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).