If 2^x=3^y=12^z then prove it 2/x = 1/z -1/y​

Which expression is equivalent to √ -80?

Find and simplify the difference of the golden ratio and its multiplicative inverse

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?