The metro theater has 20 rows of seats with 18 seats in each row tickets cost $5 the theaters income in dollars if all seats are sold is (20 x 18) x 5 use properties to find the total income.

$1800

The theater income will be the total of audience multiplied by the ticket cost.  To answer this question, you need to determine the total audience count. Assuming all the seats are occupied then:
Total audience= row of seats x seats/ row = 20x18 people = 360 people

After that the income would be:
Income = audience x ticket cost
Income= 360 people x $5 / people= $1800

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