exam Maths Puzzle Numerical Ability

One root of the function y=x^2-10x+k is 5+2isqrt3. What is the value of k?

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exam Other Question

1s+s-6/2/3=4/1/3 Find the area of the triangle ABC when c=12in, b=9in, angle A=60 degrees?

Find the area of the triangle ABC when three sides are a=9,b=12 and c=5

I need help with these, can someone show me step by step instruction thanks