Write the expression as the sum or difference of logarithms.

(1) log[b][a(b-19)]

(2) log[3](81/y)

Use the power property to rewrite the expression.

(1) log[7]r^(3)

(2) log[6]√5:(y)

(3) log[18]a^(-1)

(4) log[3]√4:(y)

write the expression as a single logarithm with coefficient 1. Assume that all variables represent positive real numbers.

(1) 5log[b]x-7log[b]y^(6)=log[b]