ANSWER:
a) 16000000
b) 80000
STEP-BY-STEP EXPLANATION:
a)
When two exponential numbers are multiplied, the exponents are added, and normal multiplication is performed between the bases, therefore
[tex](4.0\cdot10^{-3^{}})\cdot(4.0\cdot10^9)=4.0\cdot4.0\cdot10^{-3+9}=16.0\cdot10^6=16000000[/tex]
b)
When two numbers with different bases are divided, their exponents are subtracted, and between the bases the normal division is carried out, therefore
[tex]\frac{8.0\cdot10^{-5}}{1.0\cdot10^{-9}}=\frac{8.0}{1.0}\cdot10^{-5-(-9)}=8.0\cdot10^{-5+9}=8.0\cdot10^4=80000[/tex]
