Which equation has a solution of k = 6.5? -3k = 19.5
-1 + k = 7.5
-7k = -45.5
-2 + k = -8.5

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years