Question

Vector help! Stuff like this https://gyazo.com/1c432a147c3cf41b2b2865f1dcf886e8

Answer 1

Expand the brackets out, so if u = [-4,-6], v=[1,-3], -2u = [-2*-4, -2*-6]， and 4v = [4*1, 4*-3], then add -2u and 4v together.

Answer 2

its A rite?

Answer 3

yes

Answer 4

Want to stay and help me with this online assignment for medal or do you want 2 leave? I'm kinda screwed it means the diff between an A and B for this semester and I got a 75 on my first of 2 attempts

Answer 5

@alexrobin13

Answer 6

hey

Answer 7

aight

Answer 8

let me get the next prob

Answer 9

aight

Answer 10

https://gyazo.com/a04a14fc23143ca6e1b06d066a2a1e6f

Answer 11

D right?

Answer 12

x= (-7)(-6)=42, 4(8)=32, 42+32=74, so C I believe

Answer 13

ohhh got it

Answer 14

Now the 75% is starting to make sense haha

Answer 15

Hahah keep working you'll get it

Answer 16

https://gyazo.com/2b9d34424aeccdf0203c299f4502bd97

Answer 17

so you check the magnitude and angle right?

Answer 18

When I did 12 - 7 and 6 - 1 which are both 5 and compared them to the other vector which is 6 - 0 and 5 - 0 which is 6 and 5 I decided that they weren't equal. Is that true?

Answer 19

Let me do some quick math, not used to the formatting of the questions.

Answer 20

I believe you are right, that's what I found as well

Answer 21

https://gyazo.com/4020eee33b7cf9ffa0602b44e6905953 Pretty sure I got this right since it's the vector over the magnitude

Answer 22

Your reasoning makes sense

Answer 23

and same thing for this? https://gyazo.com/eceaa490fd76de53866d70aa88bcd0f9

Answer 24

yes!

Answer 25

And how do these work https://gyazo.com/9984897e35d9dd26aeacae012d6e17f3

Answer 26

I know the magnitude but I don't know the second part

Answer 27

do you know cos, sin, etc?

Answer 28

yea, I think I'm remembering something. Inverse of tan|(b/a)| right?

Answer 29

thats right

Answer 30

http://web2.0calc.com/

Answer 31

52.4

Answer 32

Correct

Answer 33

So my friend said to do <cos240,sin240> for this https://gyazo.com/8db809d93a89ba4b05105d31dfed12b5 is that right?

Answer 34

Multiplied by 16

Answer 35

what are we looking for?

Answer 36

the vector given angle and magnitude

Answer 37

went with D

Answer 38

He's right then

Answer 39

I found the same

Answer 40

https://gyazo.com/68c1d96365385df186a8a729f241b849 So in this problem a stands for the number in ai + bj linear form thing. So do I do cos45?

Answer 41

which would be rad2/2

Answer 42

but how do I get b?

Answer 43

cos for i and sin for j

Answer 44

but do I do sin45?

Answer 45

yes, it's the same value as cos45

Answer 46

And why do I use 45 for b when it's a

Answer 47

I don't understand your question

Answer 48

Oh okay

Answer 49

So it states that a = 45deg. So that's cos45. But how do I know that b is 45deg and do sin45

Answer 50

If its the same force/line it will have the same angle

Answer 51

ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

Answer 52

yes

Answer 53

Ok I have a really crucial question. https://gyazo.com/d69a4eabe6f482f3055e62a211fc559c Last time I did this I got 16sqin no matter how I tried it but it isn't one of the answer choices. Is the problem wrong?

Answer 54

whats the question haha

Answer 55

https://gyazo.com/d69a4eabe6f482f3055e62a211fc559c

Answer 56

I know but whats it asking

Answer 57

oh mb

Answer 58

Its looking for area using heron's formula

Answer 59

I'm not familiar with Heron;s formula, give me a minute.

Answer 60

I'm getting 16... as well. Not sure if it's because I'm unfamiliar though

Answer 61

My friend didn't mention any problems with the quiz but this is really frustrating ;p

Answer 62

Do you think it would be safe to guess 32 since it's the only number to have a relationship with 16?

Answer 63

Are you sure it's asking that?

Answer 64

I don't think it's safe to assume that no

Answer 65

https://gyazo.com/23032fd1f27a5799f10b7217c138df9b

Answer 66

I'm really not sure, I really think the answer is 16. Did he have a different test perhaps?

Answer 67

No it's the same. I'm not sure if he got 100% on it though we only talked briefly.

Answer 68

Im going to skip that for now. 2 left. https://gyazo.com/2a5ef5e761a6f80b0f51da44d9bdc478

Answer 69

I even put the info in a calculator, giving me 16.

Answer 70

I think my teacher put in the wrong answers

Answer 71

Maybe, what'd you get for the next one

Answer 72

so for https://gyazo.com/2a5ef5e761a6f80b0f51da44d9bdc478 I would start with the x1 vector spot and do -8 = x - (-2)

Answer 73

I think A

Answer 74

I mean -8 = -2 - x

Answer 75

which gives you 6

Answer 76

yea which then repeated for the x2 spot gives me 3

Answer 77

cool

Answer 78

awesome

Answer 79

https://gyazo.com/52335054c6eb4ff90e30592ca0a689b2

Answer 80

B?

Answer 81

Do you agree

Answer 82

so I found the magnitude which was 5^2 + 12^2 which was 169 who's sqrt is 13 so B?

Answer 83

yes

Answer 84

So I have 5 problems left but they're simply solving triangles using either heron's or law of sines or law of cosine. The only troublesome one is that silly incorrect one

Answer 85

Okay!

Answer 86

So what do you think I should do about it?

Answer 87

Answer 12, it's the closest to 16, and politely ask your teacher to explain to you how to find the right answer. They'll probably find their mistake.

Answer 88

ok

Answer 89

ok

Answer 90

Do you think I can use a online triangle solver to check myself for those other 5?

Answer 91

Definitely, just be careful entering values!

Answer 92

if you have any trouble let me know

Answer 93

Ok I'll fan+medal

Answer 94

awesome

Answer 95

Do you think that it's possible that he did the problem in radians and not degrees?

Answer 96

90%