exam Maths Puzzle Numerical Ability

On March 5th, a couple took out a 90-day loan for $450 at 9% interest. On March 29th, they made a partial payment of $150. After making the payment, how much did they still owe?

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exam Other Question

Consider f(x)=3x^4-11x^3+10x-4; use the Rational Zero Theorem to fine a zero.
a)x=0
b)x=1
c)x=-5
D)x=-1 It takes 1 hour longer to fly to St. Paul at 200 mi/h than it does to return at 250 mi/h. How far away is St. Paul?