please help- I know this is technically 4 questions- they are short and easy but i can't retrace my memories. ??

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+ - + 7 ( 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