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

I have the following problem:

If 2f(x)+f(1-x)=x2(this should be "x-squared"), what is f(x)?

The answer is f(x)=1/3x2+2/3x-1/3. But how in the world do you get to this answer
Write the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept. McGraw Hill 6th edition. 7.1 problem # 16. Thanks so very much for your help!!

Slope: -2;y-intercept: (0,4)