Radon-22 has a half-life of approximately 4 days. If you begin with a sample containing 32 grams of radon, how many grams of radon will be left after 20
days? Show your work.

increases it

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

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hope this !