exam Maths Puzzle Numerical Ability

Just taking algebra again after 21 years. Have a simple question. How do I solve (3/5)^-2? Do I multiply 3/5 twice and it is positive because of the two negatives? That answer would be 9/25??

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exam Other Question

Find an equation of the line that has the same y-intercept as the line x - 3y = 6 and contains the point (5,-1). Factor the following trinomial:

16x^2 + 40xy + 25y^2

I am still a little confused by this stuff. I hope that someone can help me understand????