exam Maths Puzzle Numerical Ability

Solve for x: 64(^x-2)=16(^1/3) I think the answer is x=20/9 ???

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exam Other Question

Add and Subtract the following polynomials:
1. (-7x^2 + 5xy - 2y^2) + (3x^2 - 5xy - 4y^2)
2. (6r^3 - 8rs + 4s^2) - (-5r^3 + 3rs + s^2)
3. (7a^4 + 8ab + b^2) + (-5a^4 - 8ab - 4 the sum of two numbers is 12. three times the larger minus 4 is equal to 5 times the smaller. what are the numbers?