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

FACTOR EACH EXPRESSION:

40- 5T CUBED
Please help me write:
[2(cos (5pi/16) + i sin (5pi/16))]^4 in the standard form a + bi.

Thank you, Tami