Can someone please help me put this in order

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]

Find the value of x. give reasons to justify your solutions! c ∈ ae

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.