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elena-s [515]
2 years ago
13

Stacy is a salesperson. She sold a microscope for $55 and earned 20% commission. How

Mathematics
1 answer:
Artyom0805 [142]2 years ago
4 0

Answer:

11

Step-by-step explanation:

20% of 55

So, 55 x 0.20 = 11

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Harry is trying to solve the equation 0 = 2x2 − x − 6 using the quadratic formula. He has made an error in one of the steps belo
bija089 [108]
<h3><u>Given</u> - </h3>

➙ a quadratic equation in which Harry lagged due to an error made by him, 2x² - x - 6= 0

<h3><u>To solve</u> - </h3>

➙ the given quadratic equation.

<h3><u>Concept applied</u> - </h3>

➙ We will apply the quadratic formula as given in the question. So, let's study about quadratic equation first because we are supposed to apply the formula in equation.

What is quadratic equation?

➙ A quadratic equation in the variable x is an equation of the form ax² + bx + c = 0, where a, b, c are real numbers, a ≠ 0.

Now, what is quadratic formula?

➙The roots of a quadratic equation ax + bx + c = 0 are given by \sf{\:\frac{-b \pm\: \sqrt {b ^ 2 - 4ac}}{2a}} provided b - 4ac ≥ 0.

<h3><u>Solution</u> - </h3>

here as per the given quadratic equation,

a = 2, b = -1 and c = -6

putting in the formula,

\implies\sf{x=\frac{-(-1) \pm\: \sqrt {(-1)^2 - 4(2)(-6)}}{2(2)}}

\implies\sf{x=\frac{1 \pm\: \sqrt {1+48}}{4}}

\implies\sf{x=\frac{1 \pm\: \sqrt {49}}{4}}

\implies\sf{x=\frac{1 \pm\: 7}{4}}

Solving one by one,

\implies\sf{x=\frac{1 + \: 7}{4}}

\implies\sf{x=\frac{8}{4}}

\implies{\boxed{\bf{x=2}}}

________________

\implies\sf{x=\frac{1 - \: 7}{4}}

\implies\sf{x=\frac{-6}{4}}

\implies{\boxed{\bf{x=\frac{-3}{2}}}}

________________________________

<em><u>Note</u> - Hey dear user!! You haven't provided the solution which was solved by Harry (A.T.Q). Please go through the solution as it will help you to find the error done by Harry.</em>

<em>________________________________</em>

Hope it helps!! (:

4 0
2 years ago
Y= -3x+4 standard form
Hunter-Best [27]
Y = -3x + 4 = Slope-intercept form
Y + 3x = 4 = Standard form
8 0
3 years ago
Simplify 8r - 3j + 9j - 2r
Shkiper50 [21]

Answer:

6j + 6r :)))))))))))))))))

3 0
3 years ago
Read 2 more answers
Help!!!! please answer!!! ​
maw [93]

Answer:

116

Step-by-step explanation:

3 to the power of 4 is 81. 7x5 =35+81=116

6 0
2 years ago
Select the decimal that is equivalent to \dfrac{7}{8}
kow [346]

Answer:

a

Step-by-step explanation:

6 0
3 years ago
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