exam Maths Puzzle Numerical Ability

Find the angle between two vectors (5,2) and (-2,5)

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exam Other Question

How do i find standard form of a slope of negative 6/5 and a y intercept of negative 2? please help me complete this equation, f(x)=sqrt(3-x) and g(x)=x-5, find

f times g (x) i cant find a good example in my algebra textbook for this prob. im guessing the an