exam Maths Puzzle Numerical Ability

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7x - 2 + 3x - 9

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exam Other Question

if you were to leave a 15% tip for a meal at a restaurant where the total bill came to $13.80, how much would the tip amount to? Use the concept of slope to determine if the given figure is a parallelogram or a rectangle.

I do not understand how to determine this. I have a picture but I cannot paste it here. Can you help me with understanding the concept?