exam Maths Puzzle Numerical Ability

b+4b=-90

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If x*+p is a factor of ax^+x*+kx+b, show that k=ap and b=p. From the top of an office building 72 ft high, the angle of elevation to the apartment building across the street is 31o. From the base of the office building, the elevation is 46o. How tall is the apartment building.