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Homework answers / question archive / 1) Simplify to a single logarithm

1) Simplify to a single logarithm. State any restrictions on the variable.

log (x^{2} + 2x — 15) — log (x^{2} — 7x + 12)

2) A $21 500 investment earns 5.25% interest, compounded quarterly. How long will it take the original investment to double in value?

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