exam Maths Puzzle Numerical Ability

How do you find a solution of the exponential equation, correct to four decimals places.
20. 10^1-x = 6^x

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exam Other Question

From the compass study guide.
Algebra Placement Test Sample.
The question reads as follows.

11.For all nonzero r,t, and z values, 16r^3tz^5/-4rt^3z^2=?

I need a step by step explaination. SOLVE CUBIC EQUATION X^3 + 3X^2 - 28X = 0