exam Maths Puzzle Numerical Ability

Write the following number in scientific notation: 0.0000000372

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i hope that you can help me solve this one. thanks.
find all real solutions of the equation.
3squareroot3x+1endsqroot -5=0
The sum of the first 3 terms of a geometric series is 37/8. The sum of the first six terms is 3367/512. Find the ratio and first term