a. (10³)²x(10²)²= b.49-(-7)=

a. (10³)² x (10²)²
= (10^6) x (10⁴)
= 10^10
= 10.000.000.000

b. 49-(-7)
= 49+7
=56

(10^3)^2 = 10^3+^2 = 10^5 = 1000000
(10^2)^2 = 10^2+^2 = 10^4 = 100000
>= 100000000000


49-(-7) = 49+7 =56