In these chemical equations, each of the letters J through M represents a different element. Which equation is balanced? A.
3J2K + L2M3 → 3JM + L2K3
B.
JK + L2M → JM + 2LK
C.
2JK + 3L2M → 3LK + J2M3
D.
2JK3 + 3L2M → 6LK + J2M3

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

1. do the particles in the medium material move in the same direction of the wave or at opposite direction to the wave? explain your answer. 2. by inputting more energy into the wave, i.e a large shake of the spring, which wave property also increases? 3. are there forces of friction acting while a wave is passing through a medium?

For this question, any non-integer answers should be entered as decimals, rounded to the hundredths place.consider this data set.the mean of the data set is , and the sample proportion of numbers less than the mean is %