Question

Someone help please :)

Answer 1

6.79 x 10⁶

Further explanation  

Scientific Notation consists of 2 parts  

1. the first part: the first digit followed by the decimal point  

2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point  

To add/subtract, the exponents must be the same and then add/subtract the coefficient

• convert the largest exponent

$\tt 7.2\times 10^6\rightarrow 72\times 10^5$

• subtract the coefficients

$\tt =(72-4.1)\times 10^5\\\\=67.9\times 10^5\rightarrow 6.79\times 10^6$