exam Maths Puzzle Numerical Ability

My least favorite because I do not understand these:(
What is the focal point of 1/3(y-2)=2(^-x+5)

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exam Other Question

Of the lines listed below, which ones pass through the point (0,9)?


y=4x+9

y=5x+2

y=5x+9

y=9x+5

y=7x+1
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?