Answer: I do not understand the options you gave but but cos30º is equal to /2 which is 0.86602540378.
2.1(0.2x−1.4)=1.3(0.4x−3.5) 25 points on the line plz help
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The subtraction sign in front of the second set of parenthesis changes the signs on the terms inside those parenthesis. So this could be rewritten as 
. None of the exponents on the x are the same, so we will just express it in terms of descending powers of x. 
. This is also the same as 
if you don't like to start with a negative. Either one is correct.