How do you write 4x10-2 in standard notation?

To write ( 4 \times 10^{-2} ) in standard notation, you need to move the decimal point two places to the left, since the exponent is negative. This means you convert ( 4 ) into ( 0.04 ). Therefore, ( 4 \times 10^{-2} ) in standard notation is ( 0.04 ).