What is 1.039x10-8 in standard notation

0.00000001039 

*Tip: Just move the decimal place over the number of times the exponent is (Ex: 2.54*10^-1, all you have to do is move the decimal place over one time to the left). 
*Tip: If the exponent is positive, move it to the right. If it is negative, move it to the left. 

Hope I helped! <3

B. 2 1/2 feet. multiply 2.5 inches by 12 to get thirty inches then divide by 12 to get 2.5 feet