Solve the following and express the answer in scientific notation: (5.4 x 10^4) - (2.5 x 10^6)
A. -2.45 x 10^6
B. 2.45 x 10^6
C. -2.45 x 10^8
D. -2.44 x 10^2
I say D
using multiples of 10^6,
0.054-2.500 = -2.446
So, A
When subtracting numbers, don't subtract exponents.