exam Maths Puzzle Numerical Ability

Could someone help show how to express this in a single log and simplify if possible?

log10 x + log10 y

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exam Other Question

To complete the sale of a house, the seller accepts a 180-day note for $10,000.00 at 7% simple interest. (Both interest and principal will be repaid at the end of 180 days.) Wishin solve, being sure to reject any value of x that produces the logarithm of a negative number or the logarithm of zero in the original equation in x=-4