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@electrokid can u help me with last two

btw this isn't dif eq

r(t) = (t-sint)i + (1-cost)j
so if it is 2[r(t)] = (2t-2sint)i + (2-2cost)j
is it correct?

i am not smart

|dw:1367594323679:dw|
this is the diagram I was talking about

how does this diagram relates with vectors

|dw:1367594594073:dw|
r(t) is the position vector of that small balck strip

oh gotcha...so circumference is the vector function that models the behavior

R = 2r....?

then what is the relation between "r(t)" and R?

r(t) = 4piR...?

wait r(t) = 2R...correct?

wow...how did u do that

never mind how. but do you see how the question works?

I'll let @FibonacciChick666 continue from here