SAT Prep

Category - Math

Simplify the expression (54 × 56)/(5^( − 4) × 513 ).
  1. 1
  2. 5
  3. 25
  4. 125
  5. 625
Explanation
Answer: B - The value of the expression is 5. Use ax × ay = a^(x + y) and ax/ay = a^(x − y).
(54 × 56)/(5^(-4) × 513 ) = 5^(4 + 6)/5^( − 4 + 13) = 510/59 = 5^(10 − 9) = 51 = 5
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