exam Maths Puzzle Numerical Ability

15x-20 factor it completly, please.

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exam Other Question

please help.

ln x - ln(x-5)=ln 12

Round to three significant digits.
i am having trouble with this problem!!!!

"A projextile is fired form a cliff 200 ft above the water at an inclination of 45 degree to the horizontal, with a muzzle velocity of