Pre-Calculus Questions

[edd fedds]

Hi my name is Henryetta and I need help on the following Pre-Calculus Questions before 9:00 a.m. Friday Dec. 11th, 2009.Here are the questions:
1.)Use the coordinates for familiar angles on the unit circle to solve the equation sec(x)=-square root of 2, where pi<x<3pi/2?
a.x=4pi/3
b.x=pi/4
c.x=5pi/4
d.x=3pi/2

2.)The period of the function y=2sin(2x)-cos(3x) is?
a.4 pi
b.pi
c.2 pi
d.3 pi

3.) The domain of the funtion y=coslxl is?
a.(-1,1)
b.[-1,1]
c.(-infinity,0)
d.(-infinity, +infinity)

4.)The function f(x)=3x+4sin(2x) appears periodic when graphed in the window [-4pi,4pi].
a.true
b.false

5.)A tower is supported by a guy wire from the top of the tower to the ground 16 ft from its base. The wire makes an angle of 62 degrees with the ground. The length of the wire is?
a.30.09 ft
b.18.12 ft
c.28.41 ft
d.34.08 ft
*That's all. Please & Thank you so much.

[stapel]

What have you tried? Where are you stuck?

We'll be glad to help, but we need to see where you're having difficulty. Thank you!

[fasteddie65]

This is a repeat question. Already answered on another board.