1+1 please help the calculator won’t give me a direct answer :(

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]

The table represents a linear function. what is the slope of the function? –6 –4 4 6

Atemperature of 1.64◦f corresponds to answer in units of ◦c.