Three consecutive integers whose sum is 36

Solve: 3x+y=6 4x-2y=18 show all work !

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%

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?