book Maths Puzzle Numerical Ability

Evaluate the expression

5P2

Thanks!

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book Other Question

Find the equation of the line that passes through points (7,-2) and (5,-1)
Write the equation of the line in slope-intercept form.

I know the the slope intercept for is y = mx +b I am not sure how to solve this problem: (-3y2)2 I think it is 9y4. Is that right? I really appreciate your help! Robin