Question

1. write this number in scientific notation. 692,035,000,000
2. solve the equation. 18 - (2x + 4) = 5

Explanation:

Step1: Write in scientific - notation form

Scientific notation is $a\times10^{n}$, where $1\leqslant a<10$ and $n$ is an integer. For the number $692035000000$, move the decimal point 11 places to the left to get $a = 6.92035$. So, $692035000000=6.92035\times 10^{11}$.

Step2: Solve the equation

First, simplify the left - hand side of the equation $18-(2x + 4)=5$.
Distribute the negative sign: $18-2x-4 = 5$.
Combine like terms: $14-2x=5$.
Subtract 14 from both sides: $-2x=5 - 14=-9$.
Divide both sides by $-2$: $x=\frac{-9}{-2}=\frac{9}{2}=4.5$.

Answer:

1. $6.92035\times 10^{11}$
2. $x = 4.5$