10c: a = 3, b = 4.
This principle shows that when two numbers with the same exponent are multiplied, the equation is equal to the product of their bases to the power of their shared exponent.
10d: 2^2 x 5^2 = 10^2 (Proof: 2^2 = 4, 5^2 = 25, 4 x 25 = 100 = 10^2)
Hope this helps.