2.5x103 = 2500
3.5x102 = 350
2500 + 350 = 2850 which is 2.95x103
1.39 times 10 to the 2nd power is 139
4C2 * (-2CD2) = -8C3D2
The result is 117,649
43 times 32 = 576
729
120
114
800
8,730
790
279
18 to the 2nd power is 324. To solve you just take 18 and times it by 18. It is the same with any power problem.