1)which of the following expressions is written in scientific notation? a)73.4 x10^5 b)0.09x10^7 c)80x10^3 d)4.22x10^-3 2)which of the following is 0.0000000708 written in scientific notation? a)7.08x10^-8 b)7.8x10^-8 c)708x10^-10 d)70.08x10^-9 3)which expression represents the largest number? a)6.1x10^-7 b)4.1x10^-7 c)3.1x10^-8 d)5.1x10^-8 4)which expression is equal to 1/8000 written in scientific notation? a)8.0x10^3 b)1.25x10^-4 c)125x10^-5 d)1.25x10^4 does anybody know : )