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Questions in mathematics

[Done] Work out $\frac{2}{3}-\frac{2}{5}$. Give your answer in its simplest form.

[Done] A group of students and workers entering a metro station were asked whether they were riding the bus or the subway. The two-way table shows their answers. Types of Transportation | | Bus | Subway | Total | | :------- | --- | ------ | ----- | | Students | 27 | 21 | 48 | | Workers | 42 | 76 | 118 | | Total | 69 | 97 | | How many people were polled? A. 48 B. 69 C. 118 D. 166

[Done] 1. Five students recorded the number of hours they spent studying for an exam: 3, 5, 2, 4, and 6 hours. What is the median of study hours? 2. The scores of six basketball players in a game are: 12, 18, 10, 14, 20, and 16 points. What is the median score? 3. During a week, a family recorded the number of cups of water they consumed each day: 7, 5, 6, 8, and 9. What is the median number of cups consumed? 4. A teacher measured the reading times (in minutes) of her students during a silent reading session: 15, 20, 10, 25, 30, and 35. What is the median reading time? 5. The number of pages read by a group of students over the weekend were: 50, 40, 60, 30, and 70 pages. What is the median number of pages read?

[Done] (a) 54 + 25 (b) 35 + 35 (c) 45 + 46 (d) 56 + 23 (e) 14 + 13 (f) 29 + 15 (g) 17 + 2 (h) 13 + 29 (i) 56 + 33 (j) 40 + 39 (k) 29 + 13 (l) 59 + 20 (m) 49 + 16

[Done] Find the product. a. 19395 x 69 b. 26610 x 33 c. 72314 x 90 d. 46445 x 77 e. 57641 x 98 f. 96808 x 42 g. 15761 x 75 h. 51539 x 26 i. 41691 x 68

[Done] There are 60 minutes in one hour. The total number of minutes is a function of the number of hours, as shown in the table. Does this situation represent a linear or non-linear function, and why? | Hours | Minutes | |---|---| | 1 | 60 | | 2 | 120 | | 3 | 180 | | 4 | 240 | | 5 | 300 | A. It represents a linear function because there is a constant rate of change. B. It represents a linear function because there is not a constant rate of change. C. It represents a non-linear function because there is a constant rate of change. D. It represents a non-linear function because there is not a constant rate of change.

[Done] In a normal distribution, 68% of the data falls within 1 standard deviation of the mean. A. True B. False

[Done] Solve $\frac{1}{y}-\frac{1}{y^2}=-\frac{y-1}{y}$

[Done] $100 \div -10 =$ A. -1 B. -10 C. 1 D. 10 E. None of these

[Done] Revolve the region bounded by $y = e ^{ x }$, the $x$-axis, and the lines $x=0$ and $x=1$ about the line $y=-3$. Find the volume. $V=[?]$ Round your answer to the nearest thousandth.