book Maths Puzzle Numerical Ability

Solve by using quadratice formula: 3x^2=11x+4

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book Other Question

you are fencing in your land, which is 150 feet long and 80 feet wide.
a. what is the area of the land? (remember to include your units)
b. write an equasion showing how much ar what is the geometric mean of 5 and 15?