exam Maths Puzzle Numerical Ability

What is the equation of the circle having a diameter with endpoints (-4,4) and (2,8)? Please help:)

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exam Other Question

a florist sold 80 stalks of lilies and threw away 1/7 of the remaining stalks of lilies.the florist has 2/5 of the lilies left. how many stalks of lilies were left?

ps. do not use algebra but if there is no choice, its okay. Solve for x. round your answer to the nearest hundredth. 2.7^x-25=12