Final answer:
In an isosceles trapezoid, the base angles are equal, so m∠Q is also 71° since it is given that m∠S is 71°.
Step-by-step explanation:
In an isosceles trapezoid, the base angles are equal, meaning that angle S and angle Q are equal since they are both base angles. Given that m∠S is 71°, we can directly state that m∠Q is also 71° because they are base angles of the same isosceles trapezoid.