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3 years ago

I need help finding a sales tax rate

Mathematics

1 answer:

Hatshy [7]3 years ago

8 0

Answer:

Try this example! The link to the actual question is at the bottom.

Step-by-step explanation:

A percent is a portion of 100. If $25 is 100% of the price, and we receive 20% off then we pay 80% of the price. 100%-20%=80%. We find the new price by multiplying 25 by the percent as a decimal. 80% is 0.80.

25(0.80)=$20. The discount is $5 off.

We add tax by using the percent as we did above. Instead of calculating how much we will pay after the discount, we calculate how much the tax percent is in dollars. We take 7.5% and convert to decimal 0.075. We multiply by the price we pay $20.

0.075(20)=$1.50.

We add $1.50 to our total of $20 to pay $21.50.

Read more on Brainly.com - brainly.com/question/11753599#readmore

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Factorized Form of Quadratic Functions

Sindrei [870]

Answer:

Answers are below

Step-by-step explanation:

x-intercepts: 1 and 7

axis of symmetry: y = 4

vertex: (4,-36)

y-intercept: 28

concave up or down: concave up

If these answers are correct, please make me Brainliest!

7 0

3 years ago

Eva has some money in her wallet. She spent $18.62 buying groceries and had $43.55 left. How much money did she have in her wall

jek_recluse [69]

Answer:

Step-by-step explanation:

62.17

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3 years ago

If a rectangle is dilated by a scale factor of 2 what is the new perimeter

True [87]

Step-by-step explanation:

the new perimeter is 8 because add all sides

4 0

3 years ago

Question 5 (5 points)

Tpy6a [65]

Answer:

The solution of the system of equations is, (1,-1,2)

Step-by-step explanation:

Given system equation;

x + 5y - 3z = -10

-5x + 6y – 5z = -21

-x + 8y - 8z = -25

Matrix form is written as;

$\left[\begin{array}{ccc}1&5&-3\\-5&6&-5\\-1&8&-8\end{array}\right] \left[\begin{array}{ccc}x\\y\\z\end{array}\right] = \left[\begin{array}{ccc}-10\\-21\\-25\end{array}\right] \\\\\\det. = 1\left[\begin{array}{cc}\\6&-5\\8&-8\end{array}\right] -5\left[\begin{array}{cc}\\-5&-5\\-1&-8\end{array}\right] -3\left[\begin{array}{cc}\\-5&6\\-1&8\end{array}\right] \\\\\\det. = 1(-8) -5(35)-3(-34)= -8 - 175+ 102 = -81$

Cofactor;

$First \ row \left[\begin{array}{cc}+\\ 6&-5\\\ 8&-8\end{array}\right \left\begin{array}{cc}-\\ -5&-5\\-1&-8\end{array}\right \left\begin{array}{cc}+\\-5&6\\-1&8\end{array}\right] = [-8 \ \ -35 \ \ -34]\\\\\\\ Second \ row \left[\begin{array}{cc}-\\ 5&-3\\\ 8&-8\end{array}\right \left\begin{array}{cc}+\\ 1&-3\\-1&-8\end{array}\right \left\begin{array}{cc}-\\1&5\\-1&8\end{array}\right] = [16\ \ -11 \ \ -13]\\\\\\$

$Third \ row \left[\begin{array}{cc}+\\ 5&-3\\\ 6&-5\end{array}\right \left\begin{array}{cc}-\\ 1&-3\\-5&-5\end{array}\right \left\begin{array}{cc}+\\1&5\\-5&6\end{array}\right]= [-7 \ \ 20\ \ 31]$

$Cofactor =$ $\left[\begin{array}{ccc}-8&-35&-34\\16&-11&-13\\-7&20&31\end{array}\right]$

$inverse \ matrix =-\frac{1}{81} \left[\begin{array}{ccc}-8&16&-7\\-35&-11&20\\-34&-13&31\end{array}\right] \\\\\\$

Solution of the matrix:

$\left[\begin{array}{c}x\\y\\z\end{array}\right] = -\frac{1}{81} \left[\begin{array}{ccc}-8&16&-7\\-35&-11&20\\-34&-13&31\end{array}\right] X \left[\begin{array}{c}-10\\-21\\-25\end{array}\right] = \left[\begin{array}{c}\frac{-8*-10 }{-81 } +\frac{16*-21 }{-81 } + \frac{-7*-25 }{-81 }\\\\\frac{-35*-10 }{-81 } +\frac{-11*-21 }{-81 }+ \frac{20*-25 }{-81 }\\\\\frac{-34*-10 }{-81 }+ \frac{-13*-21 }{-81 }+ \frac{31*-25 }{-81 }\end{array}\right] \\\\\$

$\left[\begin{array}{c}x\\y\\z\end{array}\right] = \left[\begin{array}{c}\frac{-81}{-81} \\\\\frac{81}{-81} \\\\\frac{-162}{-81} \end{array}\right] = \left[\begin{array}{c}1\\-1\\2\end{array}\right]$

Therefore, the correct option is (1,-1,2)

5 0

3 years ago

Which expression is equivalent to (3x+4)(7x-2)

Cerrena [4.2K]

Answer:

21x² + 22x - 8

Step-by-step explanation:

(3x+4)(7x-2) = 21x² - 6x + 28x - 8 = 21x² + 22x - 8

6 0

3 years ago

Read 2 more answers