exam Maths Puzzle Numerical Ability

Solve by completing the square:
x2 + 6x + 4 = 0

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exam Other Question

1. Mona invest $100 at 8% yearly interest. How much does she have to invest at 9% so that the total yearly interest from the two investments exceds $26.?

2. Thanh has scores of QUESTION: SOLVE THE FOLLOWING LINEAR INEQUALITIES BY GRAPHING

X-3Y>6
3X+2Y>12