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Questions in mathematics

[Answered] \begin{tabular}{|l|l|} \hline 8. & $5 \times 0.8$ \\ \hline 9. & $6 \times 0.8$ \\ \hline 10. & $7 \times 0.8$ \\ \hline 11. & $1.4 \times 10$ \\ \hline 12. & $2.5 \times 10$ \\ \hline 13. & $3.6 \times 10$ \\ \hline \end{tabular}

[Answered] Has the marrying age of a man changed over the years? The United States Bureau of the Census takes a formal count of everyone in the U.S. every 10 years and has provided the following data that gives the median age of an American man at the time of his first marriage. \begin{tabular}{|l|l|l|l|l|l|l|l|l|l|l|} \hline Year & 1910 & 1920 & 1930 & 1940 & 1950 & 1960 & 1970 & 1980 & 1990 & 2000 \\ \hline Median Age & 25.1 & 24.6 & 24.3 & 24.3 & 22.8 & 22.8 & 23.2 & 24.7 & 26.1 & 26.8 \\ \hline \hline \end{tabular} Is the average rate of change zero over any ten-year period? If so, when? a. Yes, 1930-1940 b. Yes, 1950-1960 c. Yes, both 1930-1940 and 1950-1960 d. No

[Answered] [tex]\sqrt{-54}[/tex]

[Answered] Write an equivalent expression by distributing the "-" sign outside the parentheses: $-(-7x + 3.2y + 8.3)$

[Answered] Mai has a jar of quarters and dimes. She takes at least 10 coins out of the jar and has less than $2.00. a. Write a system of inequalities that represents the number of quarters, $q$, and the number of dimes, $d$, that Mai could have. b. Is it possible that Mai has each of the following combinations of coins? If so, explain or show how you know. If not, state which constraint—the amount of money or the number of coins—it does not meet. (From Unit 2, Lesson 25.) i. 3 quarters and 12 dimes ii. 4 quarters and 10 dimes iii. 2 quarters and 5 dimes

[Answered] Consider the following: $\overline{A B}$ with Point C lying between both endpoints. $\begin{array}{l} \overline{A C}=9 x+7 \\ \overline{C B}=-3 x+20 \\ \overline{A B}=39 $\end{array} Create an equation to solve for $x$. (a) $\square$ (b) $x=$ $\square$ (c) $\overline{A C}=$ $\square$ (d) $\overline{C B}=$ $\square

[Answered] Solve the equation and check your solution: [tex]x=\frac{x-5}{2}=\frac{4 x}{3}[/tex]

[Answered] Which expression is equivalent to $(f g)(5)$? A. $f(5) \times g(5)$ B. $f(5)+g(5)$ C. $5 f(5)$ D. $5 g(5)$

[Answered] $3 x-\frac{2 x+6}{3}=16-\frac{x+2}{2}$

[Answered] Select the correct answer from each drop-down menu. The table shows the number of games a chess player won in professional competitions, based on the number of games played. \\begin{tabular}{|c|c|c|c|c|c|} \hline Games Played $(x)$ & 10 & 15 & 20 & 25 & 30 \\hline Games Won $(y)$ & 4 & 10 & 16 & 21 & 25 \\hline \end{tabular} The line of best fit for the situation is $\square$ . If the chess player plays $40$ games in the next competition, the expected number of games won would be approximately $\square$ .