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Mathematics 9 Online
RhondaSommer (rhondasommer):

@jim_thompson5910

RhondaSommer (rhondasommer):

how do I do this one

jimthompson5910 (jim_thompson5910):

we'll have to go through each answer choice one by one

RhondaSommer (rhondasommer):

ewww

jimthompson5910 (jim_thompson5910):

vector a = <2,4> what is the magnitude of vector a?

RhondaSommer (rhondasommer):

so square root of 104 is the first one

jimthompson5910 (jim_thompson5910):

yeah it's a long problem

RhondaSommer (rhondasommer):

and the square root of 89 is the second one

jimthompson5910 (jim_thompson5910):

`so square root of 104 is the first one` that is the magnitude of the sum of the vectors a+b = c = <2,10> magnitude of vector c = sqrt(104)

jimthompson5910 (jim_thompson5910):

hold on

RhondaSommer (rhondasommer):

and the square root of 61 is the second one

jimthompson5910 (jim_thompson5910):

let's stick to the first answer choice for now

RhondaSommer (rhondasommer):

oh ok

jimthompson5910 (jim_thompson5910):

ok so we're just on the first choice where a = <2,4> b = <0,6> c = a+b = <2,10> you found that ||c|| = sqrt(104) which is correct

jimthompson5910 (jim_thompson5910):

what is ||a|| equal to?

jimthompson5910 (jim_thompson5910):

`what is ||a|| equal to?` is the same as asking `what is the magnitude of vector a = <2,4>?`

RhondaSommer (rhondasommer):

140?

RhondaSommer (rhondasommer):

brb

jimthompson5910 (jim_thompson5910):

140 is incorrect. I'll be right back as well

jimthompson5910 (jim_thompson5910):

ok I'm back

jimthompson5910 (jim_thompson5910):

were you able to find the magnitude of vector 'a' @RhondaSommer ?

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