Determine whether the underlined numerical value is a parameter or a statistic. Explain your reasoning. In a poll of a sample of 12,000 adults in a certain city, \( 12 \% \) said they left for work before 6 a.m. Choose the correct answer below. A. Statistic, because the data set of a sample of 12,000 adults in a city is a sample. B. Parameter, because the data set of all adults in a city is a population. C. Parameter, because the data set of a sample of 12,000 adults in a city is a population. D. Es. Statistic, because the data set of all adults in a city is a sample. F. Statistic, because the data set of a sample of 12,000 adults in a city is a population. G. Parameter, because the data set of all adults in a city is a sample. H. Parameter, because the data set of a sample of 12,000 adults in a city is a sample.

Elercicio \( 1[15 \) puntos] Calcula: \( \begin{array}{lll}\text { a) } \lim _{x \rightarrow 2} \frac{x^{2}-5 x+6}{x-2} & \text { b) } \lim _{x \rightarrow+\infty}\left(1-\frac{2}{3}\right)^{x} & \text { c) } \lim _{x \rightarrow 3}\left(\frac{\sqrt{x+1}-2}{x-3}\right)\end{array} \)

3. \( y=\tan (\pi x) \)

A substance decays \( 10 \% \) each year. Find the initial amount of the substance when there are about 5.8 grams remaining after 9 years. Round your answer to the nearest whole number. The initial amount of the substance is about \( \square \) grams.

2. Даны точки \( A(1,-\boldsymbol{k}, 2), B(2,3,-1), C(2,-2,4), D(-1,1,3) \), являющиеся вершинами пирамиды \( A B C D(k- \) номер по журналу). Найдите: а) вектора АВ, \( \mathrm{AC}, \mathrm{AD} ; \) б) площадь треугольника \( A B C \); в) объем пирамиды \( A B C D \); г) косинус угла \( B A C \).

A chocolate factory charges \( \$ 30 \) per month for delivery plus \( \$ 0.60 \) for each bar of chocolate. For A-D choose the amount that could represent Ellie's chocolate bar service bill if she orders at least 18 chocolate bars but less than 35 chocolate bars. (A) 52.8 (B) 46.2 (C) 55.8 (D) 39.6