PlSSSSSSSSSSSSSSS HELP ME WITH MY MATH EXAM I WILL LIKE STAR GIVE U BRAINLY PLS

Answer:
6.3 * 10^-8
Step-by-step explanation:
3.27 - 2.64 = 0.63, but for scientific notation, you need a number that's larger than 1 as the multiplier, so we change it to 6.3 and 0.63 but chang *-7 to *-8