Question

It is estimated that there are 7,500,000,000,000,000,000 grains of sand on all the beaches of the world. How is this number written in scientific notation? А 7.5 x 1015 B 7.5 x 1019 с 7.5 x 1017 D 7.5 x 1018

Answer 1

`=\text{ 7.5 }*10^(18)\text{ (option D)}`

Step-by-step explanation:

To write in scirentific notation, we start counting from the right towards the left. We start from the last number to the first number

Scientific notation:

`\begin{gathered} 7.5\text{ }*10^{number\text{ of movement to the first number }} \\ number\text{ of movement to the first number = 18} \\ =\text{ 7.5 }*10^(18) \end{gathered}`