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a) 2x + y < 7

b) 2x - y > 7

c) 2x + y < -7

d) the correct inequality is not listed

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

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

Find the arc length of the semicircle. 7the grade