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**Complete the following:**

a. Evaluate log_{3}(243)

b. Evaluate log_{2}(128)

c. Rearrange *y* = 5^{x} to give an equation for *x* in terms of a logarithm

d. Rearrange log_{7}(*x*) = 2 to give an equation for *x* in terms of an exponent, and hence solve for *x*