 # College math questions and answers

Recent questions in Post Secondary waigaK 2020-10-18

### Consider the following function. $f\left(x\right)=\frac{{x}^{2}}{{x}^{2}-81}$ a) To find the critucal numbers of f. b) To find the open interval on which function is increasing or decreasing. c) To identify the relative extremum. floymdiT 2020-10-18

### Determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. 1 gram = 1000 kilograms ___ illusiia 2020-10-18

### A February 2007 Gallup Poll question asked, “In politics, as of today, do you consider yourself a Republican, a Democrat, or an Independent?” The possible responses were "Democrat". "Republican". “Independent”, “Other”, and “No Response”. What kind of variable to the response? zi2lalZ 2020-10-18

### Suppose a product costs R10 and the profit rate is 20% on the cost price, find the selling price York 2020-10-18

### Which of the following stetements bset descibes correlation analysis in a simple linear regression a. Correlation analysis measures the strenght of relationship between two categorical variables. b. Correlation analysis measures the direction of relationship between two numerical variables. c. Correlation analysis measures the strenght and direction of relationship between two numerical variables. d. Correlation analysis measures the strenght of relationship between two numerical variables." Isa Trevino 2020-10-18

### What tis the complete domain D and range R of the following multivariable functions: $w\left(x,y\right)=\frac{1}{x\left(y-1\right)}$ illusiia 2020-10-18

### Given the full and correct answer the two bases of $B1=\left\{\left(\begin{array}{c}2\\ 1\end{array}\right),\left(\begin{array}{c}3\\ 2\end{array}\right)\right\}$ ${B}_{2}=\left\{\left(\begin{array}{c}3\\ 1\end{array}\right),\left(\begin{array}{c}7\\ 2\end{array}\right)\right\}$ find the change of basis matrix from ${B}_{1}\to {B}_{2}$ and next use this matrix to covert the coordinate vector ${\stackrel{\to }{v}}_{{B}_{1}}=\left(\begin{array}{c}2\\ -1\end{array}\right)$ of v to its coodirnate vector ${\stackrel{\to }{v}}_{{B}_{2}}$ beljuA 2020-10-18

### Give full and correct answer for this question, the chi-square test can be used: Select one: a. to make inference about a population mean. b. to test for survey error. c. to compare more than two independent proportions. d. for pairwise multiple comparisons of means. e. to test for difference in two variances. Wribreeminsl 2020-10-18

### Given the elow bases for ${R}^{2}$ and the point at the specified coordinate in the standard basis as below, (40 points) $\left(B1=\left\{\left(1,0\right),\left(0,1\right)\right\}$& $B2=\left(1,2\right),\left(2,-1\right)\right\}$(1, 7) = ${3}^{\ast }\left(1,2\right)-\left(2,1\right)$ $B2=\left(1,1\right),\left(-1,1\right)\left(3,7={5}^{\ast }\left(1,1\right)+{2}^{\ast }\left(-1,1\right)$ $\left(8,10\right)={4}^{\ast }\left(1,2\right)+{2}^{\ast }\left(2,1\right)$ B2 = (1, 2), (-2, 1) (0, 5) = (1, 7) = a. Use graph technique to find the coordinate in the second basis. (10 points) b. Show that each basis is orthogonal. (5 points) c. Determine if each basis is normal. (5 points) d. Find the transition matrix from the standard basis to the alternate basis. (15 points) Yasmin 2020-10-18

### In statistics, random samples are used to make generalizations, or inferences, about a population. Give a full correct answer for this question its true or false? ossidianaZ 2020-10-18

### How to solve this confidence interval? Use the confidence interval to find the estimated margin of error. Then find the sample mean. A store manager says a confidence interval of (44.07, 80.97) when estimating the mean price (in dollars) for the population of textbooks. floymdiT 2020-10-18

### The type of conic sections for the nondegenerate equations given below. a) b) c) a2linetagadaW 2020-10-18

### Find the x-and y-intercepts of the graph of the equation algebraically. $4x-5y=12$ Haven 2020-10-18

### To calculate: The probability that a student chosen randomly from the class is not going to college if the number of students in a high school graduating class is 128, out of which 52 are on the honor roll, and out of these, 48 are going to college. The number of students who are not on the honor roll is 76,out of these 56 are going to college. Braxton Pugh 2020-10-18

### To calculate: The points needed on the final to avetage the points to 75. Given information: Grades in three tests in College Algebra are 87, 59 and 73. The average after final is 75. facas9 2020-10-18

### Self-Check A student scores 82, 96, 91, and 92 on four college algebra exams. What score is needed on a fifth exam for the student to earn an average grade of 90? CheemnCatelvew 2020-10-18

### A population of values has a normal distribution with $\mu =239.5$ and $\sigma =32.7$. You intend to draw a random sample of size $n=139$. Find the probability that a single randomly selected value is greater than 235.9. $P\left(X>235.9\right)=$? Write your answers as numbers accurate to 4 decimal places. Falak Kinney 2020-10-18

### Use Green's Theorems to evaluate ${\oint }_{C}xydx+{x}^{2}{y}^{3}dy$, where C is the triangle with vertices(0,0),(1,0)and (1,2). Wotzdorfg 2020-10-18

### Suppose f has absolute minimum value m and absolute maximum value M. Between what two values must $\int {0}^{2}f\left(x\right)dx$ lie? Which property of integrals allows you to make your conclusion? tinfoQ 2020-10-18

### Laplace transforms A powerful tool in solving problems in engineering and physics is the Laplace transform. Given a function f(t), the Laplace transform is a new function F(s) defined by $F\left(s\right)={\int }_{0}^{\mathrm{\infty }}{e}^{-st}f\left(t\right)dt$ where we assume s is a positive real number. For example, to find the Laplace transform of $f\left(t\right)={e}^{-t}$, the following improper integral is evaluated using integration by parts: $F\left(s\right)={\int }_{0}^{\mathrm{\infty }}{e}^{-st}{e}^{-t}dt={\int }_{0}^{\mathrm{\infty }}{e}^{-\left(s+1\right)t}dt=\frac{1}{\left(s+1\right)}$ Verify the following Laplace transforms, where u is a real number. $f\left(t\right)=1\to F\left(s\right)=\frac{1}{s}$

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