Question 114576
Let's take them one at a time. 
57) {{{10^-5}}} is the same as {{{1/(10^5)=1/(100000)=0.00001}}}

58) {{{10^-8}}} is the same as {{{1/(10^8)=1/(100000000)=0.00000001}}}

58) {{{4x10^-1}}} is the same as {{{4(1/(10^1))=4(1/(10))=4/10=0.4}}}

59) {{{6x10^-4}}} is the same as {{{6(1/(10^4))=6(1/(10000))=6/10000=0.0006}}}