A lamp is on sale, and its price is reduced from $80 to $50. What is the percent of decrease?

Mathematics

2 answers:

fredd [130]2 years ago

7 0

It's 37% put 80-37% and it will give u 50

leonid [27]2 years ago

5 0

$\frac{30}{80}$ is the fraction of decrease. Converting this to a fraction with a denominator of 100, we get the fraction;
$\frac{37.5}{100}$
Now we just take the numerator of the number to get the percent, which is the solution.

37.5%

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$\left[\begin{array}{rrrr}1&0\\0&-1\end{array}\right] \left[\begin{array}{rrrr}9&7&3&2\\-3&-7&-7&-5\end{array}\right]$

The reason the above matrix value for the matrix operation are correct are as follows:

Known parameters:

From the diagram, we have that the coordinates of the vertices of the preimage are;

(2, -5), (3, -7), (9, -3), and (7, -7)

The coordinates of the vertices of the image are;

(2, 5), (3, 7), (9, 3), and (7, 7)

Required:

The matrix operation for the transformation of the preimage points to the image points

Solution:

The transformation from the coordinates of the vertices of primage to the vertices of image involves the change in the sign from negative to positive, of the y-values of the image, which can be obtained by multiplying by (-1)

Therefore, the required matrix operation is presented as follows:

$\mathbf{\left[\begin{array}{rrrr}1&0\\0&-1\end{array}\right] \left[\begin{array}{rrrr}9&7&3&2\\-3&-7&-7&-5\end{array}\right]} =\left[\begin{array}{rrrr}9&7&3&2\\3&7&7&5\end{array}\right]$