exam Maths Puzzle Numerical Ability

Suppose that a polynomial function of degree 4 with rational coefficients has 6, 4, 5i as zeros. Find the other zero.

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exam Other Question

Solve the following system of linear inequalities by graphing.
3x+4y<12
x+3y<6
x>0
y>0


Can someone help me I am stuck?
Joe was charged $782 interest for 1 month on a $4600 credit card balance. What was the monthly interest rate?