Precalculus Solutions | Expert Assistance for Problems & Examples

Dilate (0,6) and (-6,0) by a factor of $\frac{5}{6}$ .

glasskerfu 2021-01-13

write the polynomial $P (x) = x^{2},$ if possible as a linear combination of the polynomials $1 + x, 2 + x^{2}, - x .$

Tazmin Horton 2021-01-13

Find A+B
$A = [\begin{matrix} 7 & - 1 \\ 2 & 9 \\ - 7 & - 8 \end{matrix}], B = [\begin{matrix} 2 & 5 \\ - 9 & 0 \\ 8 & 6 \end{matrix}]$
a) $[\begin{matrix} 5 & 4 \\ 11 & 9 \\ - 15 & - 2 \end{matrix}]$
b) $[\begin{matrix} 5 & - 6 \\ 11 & 9 \\ - 15 & - 14 \end{matrix}]$
c) $[\begin{matrix} 9 & - 6 \\ - 7 & 9 \\ 1 & - 14 \end{matrix}]$
d) $[\begin{matrix} 9 & 4 \\ - 7 & 9 \\ 1 & - 2 \end{matrix}]$

Khaleesi Herbert 2021-01-10

The problem reads: Suppose $P (X_{1}) = .75$ and $P (Y_{2} ∣ X_{1}) = .40$ . What is the joint probability of $X_{1}$ and $Y_{2}$ ?
This is how I answered it. P( $X_{1}$ and $Y_{2}$ ) $= P (X_{1}) \times P (Y_{1} ∣ X_{1}) = .75 \times .40 = 0.3 .$
What I don't understand is how do you get the $P (Y_{1} ∣ X_{1})$ ? I am totally new to Statistices and I need to understand each part of the process in order to get the whole concept. Can anyone help me to understand why the P and X exist and what they represent?

Yulia 2021-01-10

Compose the following function and state the domain of the composed function.
$f (x) = \frac{1}{x} - 1$
$g (x) = \sqrt{1 - x^{2}}$
a) $g (f (- 2))$

boitshupoO 2021-01-10

Begin by graphing
$f (x) = \log_{2} x$
Then use transformations of this graph to graph the given function. What is the vertical asymptote? Use the graphs to determine each function s domain and range.
$g (x) = \frac{1}{2} \log_{2} x$

Ayaana Buck 2021-01-10

Determine the convergence or divergence of the series.
$\sum_{n = 3}^{\infty} \frac{1}{n (\ln n) [\ln (\ln n)]^{4}}$

nagasenaz 2021-01-10

Write the matrix equation as a system of linear equations without matrices.
$[\begin{matrix} - 1 & 0 & 1 \\ 0 & - 1 & 0 \\ 0 & 1 & 1 \end{matrix}] [\begin{matrix} x \\ y \\ z \end{matrix}] = [\begin{matrix} - 4 \\ 2 \\ 4 \end{matrix}]$

geduiwelh 2021-01-10

Define Exponential Matrices?

sjeikdom0 2021-01-10

Find values for the variables so that the matrices are equal. $[\begin{matrix} x \\ 4 \end{matrix}] = [\begin{matrix} 6 \\ y \end{matrix}]$

CoormaBak9 2021-01-10

Show that G is an abelian under multiplication of matrices ?

foass77W 2021-01-10

If possible , find $2 A - 4 B$
$A = [\begin{matrix} - 3 & 5 & - 6 \\ 3 & - 5 & - 1 \end{matrix}], B = [\begin{matrix} - 6 & 8 & - 3 \\ 3 & 6 & - 2 \end{matrix}]$
a. $[\begin{matrix} - 30 & 42 & - 24 \\ 18 & 14 & - 10 \end{matrix}]$
b. not possible
c. $[\begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \end{matrix}]$
d. $[\begin{matrix} - 9 & 13 & - 9 \\ 6 & 1 & - 3 \end{matrix}]$
c. $[\begin{matrix} 18 & - 22 & 0 \\ - 6 & - 34 & 6 \end{matrix}]$

a2linetagadaW 2021-01-10

Use a system of linear equations to find the quadratic function
$f (x) = a x^{2} 2 + b x + c$
that satisfies the given conditions. Solve the system using matrices.
f(-2) = 6, f(1) = -3, f(2) = -14
f(x) =?

amanf 2021-01-10

compute the indicated matrices (if possible). B - C
Let
$A = [\begin{matrix} 3 & 0 \\ - 1 & 5 \end{matrix}], B = [\begin{matrix} 4 & - 2 & 1 \\ 0 & 2 & 3 \end{matrix}], C = [\begin{matrix} 1 & 2 \\ 3 & 4 \\ 5 & 6 \end{matrix}], D = [\begin{matrix} 0 & - 3 \\ - 2 & 1 \end{matrix}], E = [\begin{matrix} 4 & 2 \end{matrix}], F = [\begin{matrix} - 1 \\ 2 \end{matrix}]$

opatovaL 2021-01-08

Multiply the matrices:
$[\begin{matrix} 1 & - 1 & 0 \\ 2 & 1 & 3 \end{matrix}] [\begin{matrix} 4 & - 1 \\ 2 & 0 \\ 1 & 1 \end{matrix}]$

coexpennan 2021-01-08

Given the following: $P (A) = 0.3 P (B) = 0.2 P (A o r B) = 0.5 P (A a n d B) = 0$
Which of the following is true?
A and B are disjoint.
A and B are neither disjoint nor independent.
A and B are independent.
A and B are disjoint and independent.

Anonym 2021-01-08

Write the simplest polynomial function with the given roots. 1, 1, 2.

Tobias Ali 2021-01-08

Given $h (x) = 2 x + 4$ and $f (x) = \frac{1}{2} x + 3$ ,
Evaluate the composite function f[h(x)]

Bergen 2021-01-08

Solve the system of equations using matrices.Use Gaussian elimination with back-substitution or Gauss-Jordan elimination.
${\begin{cases} x + y - z = - 2 \\ 2 x - y + z = 5 \\ - x + 2 y + 2 z = 1 \end{cases}$

York 2021-01-07

Let $A = [\begin{matrix} - 5 & - 2 \\ 1 & 2 \end{matrix}], B = [\begin{matrix} - 3 & - 5 \\ 1 & 5 \end{matrix}]$
If possible , compute the following . If an answer does not exist , enter DNE.
AB,BA-?
True or False: AB=BA?

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