Given:cos(3x-180°)=-squr root 3/2,where 0<x<180° which values represent the solutions to the equation

a. {10°,110°,130°}
b.{20°,100°,140°}
c.{30°,330°,390°}
d.{60°,300°,420°}

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8