Brianna was collecting coins. She got 16 coins from her piggy bank and 19 coins from he brother. Her father gave Brianna 7 coins. Brianna gave 31 of the coins to her friend Evar How many coins did Brianna have left?

\( \begin{array}{l}\text { Question } 6,1.7 .23 \\ \text { Part } 1 \text { of } 8\end{array}, \begin{array}{l}\text { HW Score: } 38.46 \%, 5 \text { of } 13 \\ \text { points } \\ \text { Points: } 0 \text { of } 1\end{array} \)

Solve the equation by the method of your choice. \[ 3 x^{2}-4 x=4 \] The solution set is \( \} \). (Simplify your answer, including any radicals and \( i \) as needed. Use integers or fractions for any numbers in the expression. Use answers as needed.)

4. \( \mathrm{Q}\left(\frac{\sqrt{3}}{2}, \frac{1}{4}\right) \) Módulo:

Assume that females have pulse rates that are normally distributed with a mean of \( \mu=75.0 \) beats per minute and a standard deviation of \( \sigma=12.5 \) beats per minute. Complete parts (a) through (c) below. a. If 1 adult female is randomly selected, find the probability that her pulse rate is less than 82 beats per minute. The probability is 0.7123 . (Round to four decimal places as needed.) b. If 25 adult females are randomly selected, find the probability that they have pulse rates with a mean less than 82 beats per minute. The probability is 0.9974 . (Round to four decimal places as needed.) c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30 ? A. Since the distribution is of sample means, not individuals, the distribution is a normal distribution for any B. Since the original population has a normal distribution, the distribution of sample means is a normal distribution for any sample size. C. Since the distribution is of individuals, not sample means, the distribution is a normal distribution for any sample size. D. Since the mean pulse rate exceeds 30 , the distribution of sample means is a normal distribution for any sample size.

¿Cuáles de estas estrategias eliminan una variable en el sistema de ecuaciones? \( \left\{\begin{array}{l}-x+6 y=8 \\ 7 x-y=-2\end{array}\right. \) Elige 1 respuestas: A Suma las ecuaciones. B Multiplica por 6 la segunda ecuación, luego resta la segunda C Multiplica por 7 la primera ecuación, luego suma las ecuaciones.