Question

help please open study. problem and my solution is attached in the post

Answer 1

open study warriors?

Answer 2

@perl

Answer 3

there are 2 attachments. one is the problem, the other is how i worked the problem. is my work correct?

Answer 4

my computer is freezing and glitching out

Answer 5

your attachment is blank

Answer 6

can you see my attachments?

Answer 7

ohh neat handwriting :)

Answer 8

thank you

Answer 9

the given point is (11,-11) but none of the answer choices are correct. So I'm thinking there's a typo that is the teacher's fault.

Answer 10

may i see how you worked the problem? the way i worked the problem, i got B) for an answer. i just dont know if that is correct.

Answer 11

you got r = 11*sqrt(2) correct

Answer 12

however, the angle theta is incorrect

Answer 13

theta = arctan(-11/11)

theta = arctan(-1)

theta = -pi/4

Answer 14

that's what the answer is

Answer 15

keep in mind that the range of arctan(x) is -pi/2 < y < pi/2

Answer 16

so you're either in quadrant I or quadrant IV

Answer 17

11,-11 is quandrant 3 at the beginning of the problem. also im not sure if your taking all the steps necessary. look at a similar example at the last couple of steps

Answer 18

hold on imma upload similar example from book

Answer 19

(11,-11) is in quadrant 4

Answer 20

oh ur right. i see now, i apologize

Answer 21

thats ok

Answer 22

but i still think you are skipping a step. im aiting on a email from my phone to upload

Answer 23

waiting*

Answer 24

see the last coiple steps i am referring to by the stars i drew on the problem

Answer 25

(-1,sqrt3) were the original w,y coordinates for this problem

Answer 26

they did that correctly

Answer 27

notice how the point (-1, sqrt(3) ) and the angle 2pi/3 are both in quadrant 2

Answer 28

however, with your problem, none of the angles are in quadrant IV

Answer 29

that step is the same on a problem that lies in quadrant 4 as well, do you think that step needs to be applied to this problem?

Answer 30

3pi/4 is in quadrant 2


3pi/4 radians = 135 degrees

Answer 31

-3pi/4 radians is coterminal to 5pi/4 radians (add 2pi)

Answer 32

will you "draw" your work for the tangent formula side of my problem please?

Answer 33

5pi/4 radians = 225 degrees

so the angle is in quadrant 3

Answer 34

what do you mean?

Answer 35

one moment for another attachment please

Answer 36

jim doesnt mind if i take over?

Answer 37

what number?

Answer 38

@jim_thompson5910 does that look correct?

Answer 39

you are correct until you reach the point where you say 180 - 45 = 135

that rule of 180 - theta only works if you are in quadrant 2

Answer 40

by the way, this is why i use the 4 quadrant arctangent function, called atan2

Answer 41

ooh in q4 it should be 360?

Answer 42

yeah if you want to find the reference angle in quadrant 4

Answer 43

but the angle should be -pi/4 like you got or 7pi/4

Answer 44

none of the answer choices have that

Answer 45

this question has a typo

Answer 46

the multiple choice typo :o

Answer 47

yeah

Answer 48

choose
e. my teacher does not edit for typos

Answer 49

that would be funny if that was a test

Answer 50

one of the multiple choices

Answer 51

dont say that, this makes the 7th freakin typo i found already

Answer 52

e. none of the above : my teacher does not edit for typos

Answer 53

this is on a scantron though, e wont be counted as an answer period

Answer 54

well it's a typo, idk what else to tell you

Answer 55

do you understand that -45 degrees = 360 + (-45) degrees ?