i know this is 4 but they are simply & short- having trouble retracing my memory. please help?

1. Multiple Choice Which of the following gives an equation for 3. Multiple Choice The half-life of a radioactive substance is the line through (3, -1 ) and perpendicular to the line 8 hr. There are 5 grams present initially. Which of the follow- y = 1 - 2(x + 4)? ing gives the best approximation for when there will be 1 gram (a) y = 3 - 2(x + 1) (b) y = -1 - 2(x - 3) remaining? (a) 10 (b) 15 (c) 16 (d) 19 (c) y = 3 + - (x+ 1 ) (d) y = -1+ -(x- 3) 4. Free Response Let f(x) = ex - 2. 2. Multiple Choice If f(x) = x2 + 1 and g(x) = 2x - 1, (a) Find the domain of f. which of the following gives (fog)(2)? (b) Find the range of f. (a) 9 (b) 10 (c) 15 (d) 16 (c) Find the zeros of f