book Maths Puzzle Numerical Ability

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The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interest rate increase over the period?

Thanks, She

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Solve if possible or determine no solution or infinite solutions.

x+3y=-15
2x+5y=-21 Hi Tutors:
I submitted this problem earlier and was told to re-submit it:
The value of the function of f(x)=2x^4+4x^=2x-3 is-1. Find f(x)? I hope I worded it better this time. Thanks!