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3 years ago

if there are 39 people in a room and everyone has to shake hands with everyone exactly once, how many handshakes are there?

Mathematics

1 answer:

Aliun [14]3 years ago

8 0

if i'm not mistaken, this means that one person has to shake 38 people's hands. so, that would be 38*39, i believe.

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Which ratio is NOT equivalent to the other choices?

REY [17]

Answer:

9:5

Step-by-step explanation:

Because 5:9 = 5/9

9:5 = 9/5

5 to 9 = 5/9

5/9 = 5/9

So, 9:5 is the odd one out

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4 years ago

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Please help the ( ) means to multiply please help for 15 points

KonstantinChe [14]

Answer:

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Step-by-step explanation:

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3 years ago

How do I write 7 23/40 as a decimal

Vsevolod [243]

The decimal for this would be 7.575
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4 years ago

*FIRST ANSWER GETS BRAINLIEST*

svet-max [94.6K]

The other solution to the equation is -3.

Step-by-step explanation:

Given equation is;

5x²+bx+12=0

One solution is -4/5

We will put this solution in Eqn to get the value of b first,

$5(\frac{-4}{5})^2+b(\frac{-4}{5})+12=0\\5(\frac{16}{25})+(\frac{-4b}{5})+12=0\\\frac{16}{5}-\frac{-4b}{5}=-12\\$

Multiplying each term by 5

$5*(\frac{16}{5})-\frac{-4b}{5}*5=-12*5\\16-4b=-60\\-4b=-60-16\\-4b=-76$

Dividing both sides by -4

$\frac{-4b}{-4}=\frac{-76}{-4}\\b=19$

Putting b=19 in given Eqn

5x²+19x+12=0

Here,

a=5 , b=19 , c=12

Using quadratic formula,

$x=\frac{-b\±\sqrt{b^2-4ac}}{2a}\\x=\frac{-(19)\±\sqrt{(19)^2-4(5)(12)}}{2(5)}\\\\x=\frac{-19\±\sqrt{361-240}}{10}\\\\x=\frac{-19\±11}{10}\\$

Either, or,

$x=\frac{-19+11}{10},\ \ \ \ \ \ x=\frac{-19-11}{10}\\x=\frac{-8}{10},\ \ \ \ \ \ \ \ \ x=\frac{-30}{10}\\x=\frac{-4}{5},\ \ \ \ \ \ \ \ \ \ x= -3$

The other solution to the equation is -3.

Keywords: linear equation, quadratic formula

Learn more about quadratic formula at:

#LearnwithBrainly

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3 years ago

Gordon types 2,184 words in 28 minutes. Find the unit rate. Gordon types ________ words per minute.

pashok25 [27]

Answer:

Step-by-step explanation:

$\frac{2184 words}{28 minutes} = \frac{78 words}{1 minute}$

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3 years ago

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