Can anybody solve these for me?!

Simplify by reducing into exponential form:

a) 75
  ×  55  × 45

Clue : 72 = 23  × 32

b)  36   × 9 12 × 4             c) 49  × 121                     d)  81 18   × - 1 3 - 1 3   × 2 3

Write in exponential form and simplify.

a)  7 5   ×   7 3 49   ÷   7 8 7 2                      b)  3 0   ×   2 5   +   5 0                c)  3000   ×   8 2 5   × 5 2   × 3
 

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