exam Maths Puzzle Numerical Ability

I have 3 different problems that I am confused about. Please help me. The 1st one is2+3*5square root2-7. #2) (4/2)+4(5-2)square root 2. #3)-8-81/9*2square root 2+7. Can you pleas h

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exam Other Question
Graph the inequality

y>=1

I do not understand how to begin this problem A dress was first marked down 20% off original price. Then marked down 25
% more off the first sale price and finally 30% off the second sale price. It was sold for 63$ What was the original price? There is no textbook the teacher made it up.