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Recent questions in Multivariable functions

BenoguigoliB 2021-09-05

Use the following linear regression equation to answer the questions.
$x_{1} = 1.3 + 3.0 x_{2} - 8.3 x_{3} + 1.6 x_{4}$
(a) Which variable is the response variable?
(b) Which number is the constant term? List the coefficients with their corresponding explanatory variables.
(c) If $x_{2} = 8, x_{3} = 2, and x_{4} = 6$ , what is the predicted value for $x_{1}$ ? (Use 1 decimal place)
(d) Explain how each coefficient can be thought of as a "slope" under certain conditions.

OlmekinjP 2021-09-05

Let $f (t) = t + i$ where $- π < t < π$ and has period $2 π$ . Why is it impossible to express the Fourier series of f(t) in real form?
A. Because f(t) is a complex function with $R e (f (x)) < 0$
B. Because f(t) is a complex function with $I m (f (x)) \neq 0$
C. Because f(t) is a complex function with $I m (f (x)) = 0$
D. Because f(t) is a complex function with $R e (f (x)) > 0$

Rui Baldwin 2021-09-05

Combine variables for this equation
$f (x) = x^{2} + 7 x - 9$

Kaycee Roche 2021-09-05

Exercise No. 10 (D.E. with coefficient linear in two variables)
Find the general / solution of the following D.E.
4. $(2 x + 3 y - 5) d x + (3 x - y - 2) d y = 0$

Bevan Mcdonald 2021-09-05

Solve each equation over the set of complex numbers, find the magnitudes of the solutions and draw them in the complex plane. Hint: For some of the equations , to get n roots you must use $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ and $a^{3} - b^{3} = (a - b) (a^{2} + a b + b^{2})$
$x^{3} + 1 = 0$

aortiH 2021-09-04

(a)Show that for all complex numbers z and w
${| z - w |}^{2} + {| z + w |}^{2} = 2 {| z |}^{2} + 2 {| w |}^{2}$
(b) Let u,v be complex numbers such that $| u | = | v | = 1 and | u - v | = 2$ Use part (a) to express u in terms of v.

pancha3 2021-09-04

Solve the given differential equation by separation of variables.
$d y - (y - 8) 2 d x = 0$

CMIIh 2021-09-04

A polynomial P is given.
$P (x) = x^{4} + 36 x^{2}$
Find all zeros of P , real and complex
a. $0, \pm 6 i$
b. $0, \pm 2 i$
c.0
d. $0, \pm 2$
e. $0, \pm 6$

alesterp 2021-09-04

Find all complex zeros of the polynomial function. Give exact values. List multiple zeros as necessary.
$f (x) = x^{4} - 5 x^{3} - 36 x^{2} + 272 x - 448$
All complex zeros are=?

pancha3 2021-09-04

Solve for G.S. / P.S. for the following differential equations using separation of variables.
$x^{2} y d y - x y^{2} d x + 3 y d y - 2 x d x = 0$

Suman Cole 2021-09-04

Solve each problem and simplify it with no variables
$A = [\begin{matrix} a & - 2 \\ 1 & 3 \end{matrix}], B = [\begin{matrix} 4 & - 5 \\ b & 7 \end{matrix}]$
what is $A + B^{2}$ ?
What is $A^{2} - B$ ?

boitshupoO 2021-09-03

Sports salaries. Table shows the average salaries for players in Major League Baseball (MLB) and the National Basketball Association (NBA) in selected years since 1990.
a. Let x represent the number of years since 1990 and find exponential regression model y = abx for the average salary in MLB. Use the model to estimate the average salary (to the nearest thousand dollars) in 2022.
b. The average salary in MBL in 2000 was 1.984 million. How does this compare with the value given by the model of part (a)?

FizeauV 2021-09-03

Which of the following is false?
-If the correlation coefficient is 1, then the slope must be 1 as well.
-If the correlation between two variables is close to 0.01, then there is a very weak linear relation between them.
-Correlation coefficient and the slope always have the same sign (positive or negative).
-Correlation measures the strength of linear association between two numerical variables.

Armorikam 2021-09-03

Simplifying a rational expression with two variables.
$\frac{x^{2} + x y - 2 y^{2}}{x^{2} + 3 x y + 2 y^{2}}$

Yasmin 2021-09-03

Let $X_{1}, X_{2}, \dot{s}, X_{n}$ be n independent random variables each with mean 100 and standard deviation 30. Let X be the sum of these random variables. Find n such that Pr $(X > 2000) \geq 0.95$

Nann 2021-09-03

Second derivatives For the following sets of variables, find all the relevant second derivatives. In all cases, first find general expressions for the second derivatives and then substitute variables at the last step.
$f (x, y) = x^{2} y - x y^{2},where x = s t and y = \frac{s}{t}$

Kyran Hudson 2021-09-03

A polynomial P is given.
$P (x) = x^{4} - 16$
(a) Find all zeros of P, real and complex. (Enter your answers as a comma-separated list. Enter all answers including repetitions.)
x =?
(b) Factor P completely.
P(x) =?

Jerold 2021-08-06

An organization that tracks crime statistics reports that cars of make A model U, make A model V, and make B model W are the cars most frequently reported stolen, while cars of make C model X, make D model Y, and make E model Z are stolen least often. Is it reasonable to say that theres

Annette Arroyo 2021-06-26

Let $f (x) = 5 \cdot 2^{x}$
a. Write an equation for p, the parent function of f.
b. Give the equation for an asymptote of both p and f.

tinfoQ 2021-06-08

Write formulas for the isometries in terms of a complex variable $z = x + i y .$

The multivariable function is related to regression analysis, which may be a bit challenging for college students as they implement estimation for the various data sets. Keeping all these challenges in mind, we aim to provide you with the answers to the most popular problems and questions where a helpful multivariable function example will be of help. You should also focus on each multivariable question by starting with analysis and proper calculation of each variable as you exchange various practical sets. The purpose is to remove the constraints of single variables as you add any calculations.

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