Add. what is the sum (2 x 10") + (7 x 1016) in scientific notation? plz

9 x 10¹⁶.

To sum two numbers in scientific notation  it must be taken into account that the power of 10 has the same number and the numbers are normally added and the power of 10 is maintained.

a x 10ⁿ + b x 10ⁿ = (a + b) x 10ⁿ

Then, sum the numbers shown in the image:

(2 x 10¹⁶) + (7 x 10¹⁶) = (2 + 7) x 10¹⁶ = 9 x 10¹⁶

9 times 10^16

Explanation:

when adding or subtracting in standard form (aka scientific notation), the powers of  

10

 need to be the same. If they are just add the numbers and keep the same power of  

10

#2xx10^(16)+7xx10^(16)

= ( 2 + 7 ) × 10 ^16

=9 × 10 ^16