Planet earth has a mass of 5.9726x10 to the 24th power kilograms. and although 70% of the earths surface is made of water the waters mass is only 5x10 to the negative fourth power percent of the earths total mass. use scientific notation to estimate the mass of the planets water

goog may have it for you

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

the answer to this is a. a^2 + b^2 = c^2