7) scientific notation is a way to express extremely big and extremely small numbers using exponents. for example, the water surface area of the earth is 1.4 x 10^8. how would this number be written in standard form? 8) extremely small numbers are expressed with negative exponents. for example, the mass of a dust particle is 7.53 x 10^-10. this means the same thing as 7.53 ÷ 10^10. how would this number be written in standard form?

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# Explanation:
## Step1: Convert $1.4\times10^{8}$ to standard form
When converting $a\times10^{n}$ ($n>0$) to standard form, we move the decimal point $n$ places to the right. For $1.4\times10^{8}$, $n = 8$.
$$1.4\times10^{8}=140000000$$
## Step2: Convert $7.53\times10^{- 10}$ to standard form
When converting $a\times10^{-n}$ ($n>0$) to standard form, we move the decimal point $n$ places to the left. For $7.53\times10^{-10}$, $n = 10$.
$$7.53\times10^{-10}=0.000000000753$$

# Answer:
7) $140000000$
8) $0.000000000753$

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Explanation:

Step1: Convert \(1.4\times10^{8}\) to standard form

Step2: Convert \(7.53\times10^{- 10}\) to standard form

Answer: