Simplify each of the following using properties of exponents. Leave answers as powers

a.3^8.3^4
b.5^2.5^4.5^2
c.6^2.2^2.3^2

a. 3^12

b. 5^8
c. (6*3*2)^2 = 36^2

I have assumed that your periods represent multiplication. Better to use *