Question

I really need help this question. It’s really confusing to me

Answer 1

9.

`\left(4.1\cdot 10^3\right)+\left(3.7\cdot 10^2\right)`
`\left(4.1\cdot10^3\right)+\left(0.37\cdot10^3\right)`
`\left(4.1+0.37\right)*\left(10^3\right)`
`\left(4.47\right)*\left(10^3\right)`
`(4.1*10^3)+(3.7*10^2)=4.47*10^3`

10

`(9.3*10^(-3))-(6.9*10^(-4))`
`(9.3*10^(-3))-(0.69*10^(-3))`
`(9.3-0.69)*(10^(-3))`
`\begin{equation*} 8.61*10^(-3) \end{equation*}`
`\left(9.3*10^(-3)\right)-\left(6.9*10^(-4)\right)\:=8.61*10^(-3)`

11.

`(1.2*10^(-3))*(4*10^5)`
`(1.2*4)*(10^(-3)*10^5)`
`(4.8)*(10^(5-3))`
`(4.8)*(10^2)`
`\:\left(1.2*10^(-3)\right)*\left(4*10^5\right)\:=4.8*10^2`

12.

`(8*10^(-6))/1.6`
`(8*10^(-6))/(1.6)`
`(8*10^(-6))/(1.6)=5*10^(-6)`