(PLEASE HELP DUE NOW! I DON'T UNDERSTAND!)
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BOX AND WHISKER PLOT
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Q3:

Find the solution of this system of equation -7x+y=-20 9x-3y=36

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Find the maximum value of p= 4x + 5y subject to the following constraints :