- What are two characteristics of electromagnetic waves de we use to classify them?

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27 x (-18)? I need help solving the problem in the photo.? The ratio of the lengths of the corresponding sides of two rectangles is 1:2:5. What is the ratio of their areas? Explain? Write an equation of the form y=a cos bx, where a>0 and b>0, with an amplitude of 1/6 and a period of pi/3? Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) are the spectator ions?