book Maths Puzzle Numerical Ability

Triangle ABC has vertices A(0,4), B(1,2), and C(4,6). Determine whether triangle ABC is a right triangle. Explain.

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book Other Question

Can you show me the steps to get the answer for this problem.--- The problem as follows:

7x+3+10x

Thank you,
Candace i have a examine and i'm scared i'll fail cause my teacher didnt teach me how to do ratios rates and frations