- Solve for X: 20 X 2^2x+1 = 640?

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One fifth plus thirty three divided by one fifth? What is the maximum limit of Ammonia , Calcium and Potassium in drinking water according to WHO standard in Mg/l? Use the value of the linear correlation coefficient to calculate the coefficient of determination. r=0.358? When is my true birthday is it the local time or the universal coordinated time? Simplify 3 square root of 5 end root minus 2 square root of 7 end root plus square root of 45 end root minus square root of 28?