Which expression is equivalent to
(`12` x `10^{4}`)( `6` x `10^{5}`) ?
To simplify this expression, we can multiply the numbers outside of the exponents and add the exponents:
(`12` x `6`) x (`10^{4}` x `10^{5}`)
= `72` x `10^{4 + 5}`
= `72` x `10^{9}`
= `7.2` x `10^{10}`