write each of these values as a regular number

Question

a.  8.5 x 10⁴g, the mass of air in an average room

 

b.  2.1 x 10⁸ gallons, the volume of crude oil spilled into the Gulf of Mexico in 2010

 

c.  5.0 x 10^-3%, the concentration of CO in the air on a city street

 

d.  1 x 10^-5 g, the recommended daily allowance of vitamin D

Answer 1

a. 8.5x10⁴=85,000 (move the decimal point 4 places to the right)

 

b. 2.1x10⁸=210,000,000 (move the decimal point 8 places to the right)

 

c. 5.0x10^-3=5.0x(1/10³)=5/1000=0.005 (move the decimal point 3 places to the left because the exponent is negative)

 

d. 1x10^-5=0.00001 (move the decimal point 5 places to the left-negative exponent)