exam Maths Puzzle Numerical Ability

If a triangle of base 14 units has the same area as a circle that has a radius of 14 units, find the height of the triangle. Use. 3.14 for pi.

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I am having problems with this solution:

Solve for x: log(x - 5) + log 4 = 2

Please help. Thanks
-Ryan c. the instructions says to determine whether the pair of lines are parallel, perpendicular or neither

2x+3y=1

4x-5y=2

can you show me step by step how to determine whether these are parallel or perpendicular or neither.

thanks