exam Maths Puzzle Numerical Ability

HOW DO YOU FIND THE 3RD SIDE DISTANCE OF A TRIANGLE IF YOU ALREADY KNOW THE OTHER 2 SIDE DISTANCES.

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exam Other Question

I am struggling with this synthetic division problem, the answer I am coming up with is not what the book answer is, help:
5x²-31x+30
Please help with this question. It is not froma book but a test review.

From past experience, a teacher believes that the average score on a geometry exam is 75. A sample of 2