exam Maths Puzzle Numerical Ability

ABC is an acute triangle with cosA=1/3 and cosB=1/4.
Find cos(A+B)

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exam Other Question

Please help with this.

Use the Quadratic Formula to solve the quadratic equation.

7/8x^2 - 3/4x + 5/16 = 0

thank you Draw a line segment and a point outside the line. Construct a line through the point that is perpendicular to the segment.