A car travels at a constant speed of 70 miles per hour. The distance the car travels in

Mathematics

2 answers:

HACTEHA [7]3 years ago

5 0

Answer:

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Step-by-step explanation:

Luba_88 [7]3 years ago

5 0

<h2><em>Answer: </em></h2><h2><em> </em></h2><h2><em>The distance function is d(t)=70.t</em></h2><h2><em> </em></h2><h2><em>Step-by-step explanation: </em></h2><h2><em> </em></h2><h2><em>If an object moves at a constant rate of speed, we can determine how far the object travels by multiplying its rate by the time it has been traveling: </em></h2><h2><em> </em></h2><h2><em> distance=rate X time</em></h2><h2><em> </em></h2><h2><em>Rate is distance (given in units such as miles, feet, kilometers, meters, etc.) divided by time (hours, minutes, seconds, etc.). </em></h2><h2><em> </em></h2><h2><em>We know that a car travels at a constant speed of 70 miles per hour. </em></h2><h2><em> </em></h2><h2><em>So, the distance function is ,d(t)=70.t where t is hours and the distance is in miles</em>.</h2>

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ANSWER

EXPLANATION

For a matrix A of order n×n, the cofactor $C_{ij}$ of element $a_{ij}$ is defined to be

$C_{ij} = (-1)^{i+j} M_{ij}$

$M_{ij}$ is the minor of element $a_{ij}$ equal to the determinant of the matrix we get by taking matrix A and deleting row i and column j.

Here, we have

$C_{11} = (-1)^{1+1} M_{11} = M_{11}$

M₁₁ is the determinant of the matrix that is matrix A with row 1 and column 1 removed. The bold entries are the row and the column we delete.

$\begin{aligned} A=\begin{bmatrix} \bf 1 & \bf -6 & \bf -4\\ \bf 7 & 0 & -3 \\ \bf -9 & 8 & -8 \end{bmatrix} \implies M_{11} &= \text{det}\left(\begin{bmatrix} 0&-3 \\ 8&-8 \end{bmatrix} \right) \end{aligned}$