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