(4 × 6) ÷ (2 + 4) ÷ (8 ÷ 4)? please help

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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]

Acircle has a circumference of 28.36 units what is the diameter of the circle