exam Maths Puzzle Numerical Ability

Im really confused could someone please help?

Solve by factoring:

7a2+9a+2=0

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exam Other Question

Mix a solution that is 50% acid with a solution that is 100% water to make 4L of a solution that is 10% acid. How much of each solution do you use? What is the result of (5^x)^y multiplied by [5^(3y)]^z?