Astudent estimated a mass to be 325 g, but the actual mass is 342 g. what is the percent error?
a) 7%
b) 5%
c) 6%
d) 8%

5.2307 %

Explanation:

(acutal mass- estimated mass) / ( estimated mass)

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