How do I find the value of 30 x 60

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]

X-intercept=-5 y-intercept=2 the equation of the line is

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?