Question

What is the sum of 3.6×10^3 And 6.1×10^3

Answer 1

3.6(103)+6.1(103)=9700

Answer 2

These are scientific notations

first:
$\\ 3.6 \times {10}^{3} = 3600 \\ \\ 6.1 \times {10}^{3} = 6100$
so :
$6100 + 3600 = 9700$
now you can change it back to scientific notations
$9700 = 9.7 \times {10}^{3}$

or you can do that in an easier way: (this situation goes only if the powers of 10s are equal)

$3.6 \times {10}^{3} + 6.1 \times {10}^{3} = 9.7 \times {10}^{3}$

good luck