exam Maths Puzzle Numerical Ability

This problem stumped me, because my calculator cannot put in the fraction -3/5 * 2, i know its probaly really easy, but I still dont really know.

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exam Other Question

Hello, I've struggled with conic sections for two months and keep getting the wrong answers.
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<b>Problem #1: "Find the focus and directrix for the parabola and sketch a graph.
I am stuck on correct answer for:

The square root of 50 =


I believe answer is 25 but I need to verify my work. What is correct resolve?