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Elena-2011 [213]
2 years ago
12

I need all three answers again please help

Mathematics
1 answer:
choli [55]2 years ago
8 0

Answer:

Step-by-step explanation:

3) Sales tax rate = \frac{42.42}{499}*100

                         = 8.50

                        = 9%

4) Rate of commission = \frac{1400}{28000}*100

                                     = 5 %

5) Reduction = \frac{30}{100}*5000

                    =$ 1500

New price = 5000 - 1500

               = $ 3500

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Solve y=-3x² + 4.5x – 20<br> Use the Quadratic formula
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Answer:

x=0.75 \pm 2.47067i

Step-by-step explanation:

Quadratic Formula: x=\frac{-b \pm \sqrt{b^2-4ac} }{2a}

√-1 is imaginary number i

Step 1: Define

y = -3x² + 4.5x - 20

a = -3

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Step 2: Substitute and Evaluate

x=\frac{-4.5 \pm \sqrt{4.5^2-4(-3)(-20)} }{2(-3)}

x=\frac{-4.5 \pm \sqrt{20.25-240} }{-6}

x=\frac{-4.5 \pm \sqrt{-219.75} }{-6}

x=\frac{-4.5 \pm \sqrt{219.75}(\sqrt{-1} ) }{-6}

x=\frac{-4.5 \pm i\sqrt{219.75} }{-6}

x=\frac{4.5 \pm i14.824 }{6}

x=0.75 \pm 2.47067i

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