I need answer ASAP
Darla claims that the first periodic table developed by Mendeleev was not completely accurate, so it is not useful at all. Harmony argues that it helped establish the periodic table we use today, making it more credible. Who is correct and why?
Darla is correct, because a model that has any mistakes should be thrown out.
Darla is correct, because a good model would not need to change.
Harmony is correct, because Mendeleev’s model had all of the information correct in the first version.
Harmony is correct, because Mendeleev’s model made predictions that came true.

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit