Homework Help: Pre-Calc

Posted by Jonathan on Wednesday, September 28, 2011 at 9:18am.

I posted yesterday and didn't get a response so I'm hoping someone can check these today-Thank you they are polar coordinate questions--My answers are her I just need them checked-

1.Which of the folowing is another representation of (-3,pi)?
(3,120degree)
(3,0 degree)I think it is this one??
((-3,0 degree)

2.Which is not a representation of (5,150 degree)
(-5,-30 degree)I think it is this one?
(-5,330 degree)
(5,510 degree)

3.Give 3 representations of (3,240 degree)One has to be in radians
My choices are: (3,600 degrees)
(3,-120 degree degree)
(-3,pi/3)

4.Give 3 representations of (-6,3pi/4)one has to be radians
I gave-(-6,495 degrees)
(-6,-225 degrees)
(6,-pi/4)

Pre-Calc - bobpursley, Wednesday, September 28, 2011 at 10:05am
1 correct
2 Normally we avoid negative angles, but if one allows them, then all the answers represent 5,150
3. Ok, except are you allowing negative angles?
4. ok

Question 2 bothers me as a bad question.
Pre-Calc - Reiny, Wednesday, September 28, 2011 at 10:08am
I agree with the first three

for the last one, since the angle in the original is in radians, you should stay with radians

so (-6,11π/4) --- your first one
(-6, -5π/4) --- your 2nd
Pre-Calcbob pursley please recheck - Johnathan, Wednesday, September 28, 2011 at 10:10am
In #2 it was which one is NOT a representation , that's why I thought (-5,-30) I can't have all of them just the one that is NOT a representation
Thank you
Pre-Calc - Johnathan, Wednesday, September 28, 2011 at 10:12am
thank you
Pre-Calc - bobpursley, Wednesday, September 28, 2011 at 10:14am
I made myself clear. Just why do you think -5@-30 does not produce a ray at 5@150? The negative on the five says, add 180 to the angle.

Maybe I am missing something. Most math teachers would agree with Reiny on 4, I am an engineer, so I live in many alternative languages on math. I also speak negative angles.

Answer this Question

Related Questions

Dr.Bob can you check out the question down the pg - I posted a question ...
chemistry - hi, Can you please double check to see if i have got this right? Is ...
Anatomy/Biology-Please check - I'm posting this again today hoping someone ...
Romeo and Juliet Help (24 hours and no response) - I posted questions yesterday ...
Pre-Calc - Can you show me how to find the rectangular equation of r=2costheta...
Funny - I posted a question yesterday and I can't find it today. It was ...
French 1 - F Rewrite the following sentences replacing the expression of time ...
Math Riddle - What day would yesterday be if Wednesday was five days before the ...
Dr.Bob => Can you see the post down the pg by me - I'm trying to post...
Pre-Calculus - I posted earlier and didn't get an answer so I'm posting ...

For Further Reading

First Name:
School Subject:
Answer: