#### Answer

a) $1$ $\times$ $10^{-9}$ $s$
b) $1.43$ $\times$ $10^{-1}$ $s$
c) $1$ $\times$ $10^{-12}$ $s$
d) $1$ $\times$ $10^{-6}$ $m$

#### Work Step by Step

When converting a number from decimal notation to scientific notation, move the decimal point over to the left or right to get a number between 1 and 10. That number is multiplied by 10 to a power that is based on the direction of the decimal movement. If you have to move the decimal point to the right to get a number in scientific notation, the exponent on the base power of 10 will be negative. If you have to move the decimal point to the left to get a number in scientific notation, the exponent on the base power of 10 will be positive.