im stuck on a few problems, i tried going to the tutoring center on campus but it was so crowded i didnt have time to stay because of work. can anyone help me??

1. F(x) = 2x-7e^x

a. Relative maxes

b. relative mins

c. decreasing intervals

d. concave up intervals

2. F(x) = (e^4x) + (e^-4x)

a. Relative maxes

b. relative mins

c. decreasing intervals

d. concave up intervals

3. v(t) = 1600e^-0.2t find v ' (5)

im off to work, ill check back later hopefully someone can help