How many digits do i have to write for scientific notation?

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 value would be a solution for x in the inequality 47-4x< 7

Plot the intercepts to graph the equation