3 years ago

I dont understand :/

Mathematics

1 answer:

Nikitich [7]3 years ago

5 0

Answer:

Step-by-step explanation:

same

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Which are the solutions to the quadratic equation x^2=9x+6

AlekseyPX

I will use a quadratic formula:

$x^2=9x+6\ \ \ \ |-9x-6\\\\x^2-9x-6=0\\\\a=1;\ b=-9;\ c=-6\\\\b^2-4ac=(-9)^2-4\cdot1\cdot(-6)=81+24=105\\\\\sqrt{b^2-4ac}=\sqrt{105}\\\\x_1=\dfrac{-b-\sqrt{b^2-4ac}}{2a};\ x_2=\dfrac{-b+\sqrt{b^2-4ac}}{2a}\\\\x_1=\dfrac{-(-9)-\sqrt{105}}{2\cdot1}=\dfrac{9-\sqrt{105}}{2}\\\\x_2=\dfrac{-(-9)+\sqrt{105}}{2\cdot1}=\dfrac{9+\sqrt{105}}{2}$

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3 years ago

How do you solve 2h + 7 > 21

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$2h + 7 > 21\\
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3 years ago

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You spin the spinner and flip a coin. Find the probability of the compound event. The probability of spinning a number greater t

vagabundo [1.1K]

Answer:

Step-by-step explanation:

the coin is 1/2

the spinner is 3/4

1/2 * 3/4 = 3/8

37.5%

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3 years ago

joe and Eric have to ship 75 packages. Joe can do the job alone in 5 hours. if Eric helps, they get it done in 4 hours. How long

Umnica [9.8K]

Eric took 20 hours to do the job alone.

<u>Step-by-step explanation</u>:

<u>Given </u>:

Total work = 75 packages
Joe took 5 hours to complete the total work.

The amount of work Joe alone can do per hour = 75/5 = 15 packages.

The amount of work Joe and Eric together do per hour = 75/4 = 18.75

The amount of work Eric alone can do per hour = 18.75 - 15 = 3.75

The time Eric took to complete the entire work = 75 / 3.75 = 20 hours.

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3 years ago

At a coffee shop, the lunch bill was $18.45, not including the tip. what was the total amount of the lunch, including a tip of $

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The answer would be 18.45 + 3 = 21.45

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3 years ago

I dont understand :/​

I dont understand :/