anonymous
  • anonymous
Vector help! Stuff like this https://gyazo.com/1c432a147c3cf41b2b2865f1dcf886e8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Kenshin
  • Kenshin
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.
anonymous
  • anonymous
its A rite?
Kenshin
  • Kenshin
yes

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anonymous
  • anonymous
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
anonymous
  • anonymous
@alexrobin13
alexrobin13
  • alexrobin13
hey
anonymous
  • anonymous
aight
anonymous
  • anonymous
let me get the next prob
alexrobin13
  • alexrobin13
aight
anonymous
  • anonymous
https://gyazo.com/a04a14fc23143ca6e1b06d066a2a1e6f
anonymous
  • anonymous
D right?
alexrobin13
  • alexrobin13
x= (-7)(-6)=42, 4(8)=32, 42+32=74, so C I believe
anonymous
  • anonymous
ohhh got it
anonymous
  • anonymous
Now the 75% is starting to make sense haha
alexrobin13
  • alexrobin13
Hahah keep working you'll get it
anonymous
  • anonymous
https://gyazo.com/2b9d34424aeccdf0203c299f4502bd97
anonymous
  • anonymous
so you check the magnitude and angle right?
anonymous
  • anonymous
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?
alexrobin13
  • alexrobin13
Let me do some quick math, not used to the formatting of the questions.
alexrobin13
  • alexrobin13
I believe you are right, that's what I found as well
anonymous
  • anonymous
https://gyazo.com/4020eee33b7cf9ffa0602b44e6905953 Pretty sure I got this right since it's the vector over the magnitude
alexrobin13
  • alexrobin13
Your reasoning makes sense
anonymous
  • anonymous
and same thing for this? https://gyazo.com/eceaa490fd76de53866d70aa88bcd0f9
alexrobin13
  • alexrobin13
yes!
anonymous
  • anonymous
And how do these work https://gyazo.com/9984897e35d9dd26aeacae012d6e17f3
anonymous
  • anonymous
I know the magnitude but I don't know the second part
alexrobin13
  • alexrobin13
do you know cos, sin, etc?
anonymous
  • anonymous
yea, I think I'm remembering something. Inverse of tan|(b/a)| right?
alexrobin13
  • alexrobin13
thats right
alexrobin13
  • alexrobin13
http://web2.0calc.com/
anonymous
  • anonymous
52.4
alexrobin13
  • alexrobin13
Correct
anonymous
  • anonymous
So my friend said to do for this https://gyazo.com/8db809d93a89ba4b05105d31dfed12b5 is that right?
anonymous
  • anonymous
Multiplied by 16
alexrobin13
  • alexrobin13
what are we looking for?
anonymous
  • anonymous
the vector given angle and magnitude
anonymous
  • anonymous
went with D
alexrobin13
  • alexrobin13
He's right then
alexrobin13
  • alexrobin13
I found the same
anonymous
  • anonymous
https://gyazo.com/68c1d96365385df186a8a729f241b849 So in this problem a stands for the number in ai + bj linear form thing. So do I do cos45?
anonymous
  • anonymous
which would be rad2/2
anonymous
  • anonymous
but how do I get b?
alexrobin13
  • alexrobin13
cos for i and sin for j
anonymous
  • anonymous
but do I do sin45?
alexrobin13
  • alexrobin13
yes, it's the same value as cos45
anonymous
  • anonymous
And why do I use 45 for b when it's a
alexrobin13
  • alexrobin13
I don't understand your question
alexrobin13
  • alexrobin13
Oh okay
anonymous
  • anonymous
So it states that a = 45deg. So that's cos45. But how do I know that b is 45deg and do sin45
alexrobin13
  • alexrobin13
If its the same force/line it will have the same angle
anonymous
  • anonymous
ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
alexrobin13
  • alexrobin13
yes
anonymous
  • anonymous
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?
alexrobin13
  • alexrobin13
whats the question haha
anonymous
  • anonymous
https://gyazo.com/d69a4eabe6f482f3055e62a211fc559c
alexrobin13
  • alexrobin13
I know but whats it asking
anonymous
  • anonymous
oh mb
anonymous
  • anonymous
Its looking for area using heron's formula
alexrobin13
  • alexrobin13
I'm not familiar with Heron;s formula, give me a minute.
alexrobin13
  • alexrobin13
I'm getting 16... as well. Not sure if it's because I'm unfamiliar though
anonymous
  • anonymous
My friend didn't mention any problems with the quiz but this is really frustrating ;p
anonymous
  • anonymous
Do you think it would be safe to guess 32 since it's the only number to have a relationship with 16?
alexrobin13
  • alexrobin13
Are you sure it's asking that?
alexrobin13
  • alexrobin13
I don't think it's safe to assume that no
anonymous
  • anonymous
https://gyazo.com/23032fd1f27a5799f10b7217c138df9b
alexrobin13
  • alexrobin13
I'm really not sure, I really think the answer is 16. Did he have a different test perhaps?
anonymous
  • anonymous
No it's the same. I'm not sure if he got 100% on it though we only talked briefly.
anonymous
  • anonymous
Im going to skip that for now. 2 left. https://gyazo.com/2a5ef5e761a6f80b0f51da44d9bdc478
alexrobin13
  • alexrobin13
I even put the info in a calculator, giving me 16.
anonymous
  • anonymous
I think my teacher put in the wrong answers
alexrobin13
  • alexrobin13
Maybe, what'd you get for the next one
anonymous
  • anonymous
so for https://gyazo.com/2a5ef5e761a6f80b0f51da44d9bdc478 I would start with the x1 vector spot and do -8 = x - (-2)
alexrobin13
  • alexrobin13
I think A
anonymous
  • anonymous
I mean -8 = -2 - x
alexrobin13
  • alexrobin13
which gives you 6
anonymous
  • anonymous
yea which then repeated for the x2 spot gives me 3
anonymous
  • anonymous
cool
alexrobin13
  • alexrobin13
awesome
anonymous
  • anonymous
https://gyazo.com/52335054c6eb4ff90e30592ca0a689b2
alexrobin13
  • alexrobin13
B?
alexrobin13
  • alexrobin13
Do you agree
anonymous
  • anonymous
so I found the magnitude which was 5^2 + 12^2 which was 169 who's sqrt is 13 so B?
alexrobin13
  • alexrobin13
yes
anonymous
  • anonymous
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
alexrobin13
  • alexrobin13
Okay!
anonymous
  • anonymous
So what do you think I should do about it?
alexrobin13
  • alexrobin13
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.
anonymous
  • anonymous
ok
alexrobin13
  • alexrobin13
ok
anonymous
  • anonymous
Do you think I can use a online triangle solver to check myself for those other 5?
alexrobin13
  • alexrobin13
Definitely, just be careful entering values!
alexrobin13
  • alexrobin13
if you have any trouble let me know
anonymous
  • anonymous
Ok I'll fan+medal
alexrobin13
  • alexrobin13
awesome
anonymous
  • anonymous
Do you think that it's possible that he did the problem in radians and not degrees?
anonymous
  • anonymous
90%

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