Final answer:
To add numbers in standard index form, add the coefficients and keep the power of 10 the same.
Step-by-step explanation:
To add numbers in standard index form, the powers of 10 should be the same. In this case, both numbers have a power of 10°, so they can be added directly. When adding the numbers, you add the coefficients (the numbers in front of the 10) and keep the power of 10 the same. So, (9.2 x 10°) + (4 x 10°) = (9.2 + 4) x 10° = 13.2 x 10°.
Learn more about Standard Index Form