exam Maths Puzzle Numerical Ability

What is the sequence patten and identify the sequences as arithmetic, geometric , or neither.
1. 3,6,12,24,...
2. 1,3,5,7,...
3. 1,2,6,24,...
4. 0,7,14,21,...

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exam Other Question

Preform the indicated operation and simplify if required:
-2/x+2 + 3/x-2

Thanks in advance for your help
From a base elevation of 6400 ft. a mountain peak in Colorado rises to a summit elevation of 14725 ft over a horizontal distance of 15841. Find the grade of the peak.

The grade of the peak is 52.55 %