exam Maths Puzzle Numerical Ability

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An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid?

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exam Other Question

I need help with all steps for Cramer's Rule on the problem

4x+3y+2z=6
-2x-y+5z=5
x+2y-3z=3

thank you very much I am very confused about this Please help,

Find the value for the correlation coefficient r.

x 5, 1, 4, 2, 3
y 5, 10, 12, 4, 8

Please help