A cabinet 4 chairs and 2 tables cost $825

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Ineed in figuring out this problem.

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%