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bazaltina [42]
3 years ago
11

Armando leaves a 20% tip on a dinner bill of 12.50. how much tip does he leave?

Mathematics
1 answer:
Alex73 [517]3 years ago
3 0
Hello there! In this question, in order to find the tip Armando leaves, all you have to do is multiply the percentage by the bill. In this case, it cost $12.50, and he leaves a 20% tip. 12.50 * 20% (0.2) is 2.5. There. Armando left a tip of $2.50. The answer is C: $2.50.
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Brainly use a matrix to find the solution to the system of equations -8x-8y=-16 6x-9y=-108
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We want to use a matrix to solve
-8x - 8y = -16
6x - 9y = -108

Before solving, simplify the equations as follows:
Divide the first equation by -8 to obtain
x + y = 2             (1)
Divide the second equation by 3 to obtain
2x - 3y = -36       (2)

In matrix form, the equations are
\begin{bmatrix}1&1\\2&-3\end{bmatrix} \begin{\bmatrix} x\\y\end{bmatrix}=\begin{bmatrix}2 \\ -36 \end{bmatrix}

The determinant of the matrix is
D = (1)(-3) - (1)(2) = -5

Use Cramer's Rule.
x =  \frac{1}{D} det(\begin{bmatrix}2&1\\-36&-3 \end{bmatrix} ) =  \frac{1}{-5} (-6+36) = -6
Similalrly, 
y= \frac{1}{-5} det(\begin{bmatrix} 1&2\\2&-36\end{bmatrix} ) = \frac{1}{-5}(-36-4) =8

Answer:  (-6, 8)  or x = -6, y = 8


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3 years ago
The temperature on a summer afternoon is 76°F. Define a variable and write an expression to find the temperature after it change
Afina-wow [57]
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