Answer :

Youphoria
Polar coordinates are given by (r,θ).
Rectangular coordinates are given by (x,y)=(rcos θ,rsin θ)

You are given the r and the θ.

You need to find  what 7cos(2π3) is, then find 7sin(2π3). 

x=−7/2
y=7√3/2

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