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3 years ago

HELP!!! 3/r = 81Please explain

Mathematics

1 answer:

Stels [109]3 years ago

4 0

Answer:

243 ÷ 3 = 81 r=243

Step-by-step explanation:

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Four cards numbered 1,5,8, and 9 are placed in a bag. A card is drawn at random and then replaced. The card is drawn at random a

anzhelika [568]

Answer: D

Step-by-step explanation:

so we know the probability of drawing a 9 is 25 percent or 1/4 because 9 is only one and doesn't repeat.

So the cards we drawn cards we drawn 2 times so multiply 1/4 times two.

1/4 * 2/1= 2/4 = 1/2

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2 years ago

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Find the median and mean of the data set below: 30, 39, 24, 19, 18 Median Mean

Eva8 [605]

Answer: mean=26 , median=24

Step-by-step explanation:

Mean=Sum of all values/number of values

mean= 30+39+24+ 19+18/5

= 130/5

mean=26

Median

arrange data in order

18,19,24,20,39

In the case of ungrouped odd-numbered data, the number that divided data into 2 equal parts is called the median.

so median=24

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2 years ago

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Prove that the triangle EDF is isosceles. Give reasons for your answer.

Gekata [30.6K]

Answer:

$\triangle EDF$ is isosceles.

Step-by-step explanation:

Please have a look at the attached figure.

We are given the following things:

$\angle EDF = y$

$\text{External }\angle DFG = 90 +\dfrac{y}{2}$

Let us try to find out $\angle E$ and $\angle DFE$ . After that we will compare them.

Finding  $\angle DFE$ :

Side EG is a straight line so $\angle GFE = 180$

$\angle GFE$ is sum of internal $\angle DFE$ and external $\angle DFG$

$\angle GFE = 180 = \angle DFE + \angle DFG\\\Rightarrow 180 = \angle DFE + (90+\dfrac{y}{2})\\\Rightarrow \angle DFE = 180 - 90 - \dfrac{y}{2}\\\Rightarrow \angle DFE = 90 - \dfrac{y}{2} ....... (1)$

Finding  $\angle E$ :

Property of external angle: External angle in a triangle is equal to the sum of two opposite internal angles of a triangle.

i.e. external $\angle DFG$ = $\angle E + \angle EDF$

$\Rightarrow 90+\dfrac{y}{2} = \angle E + y\\\Rightarrow \angle E = 90+\dfrac{y}{2} -y\\\Rightarrow \angle E = 90-\dfrac{y}{2} ....... (2)$

Comparing equations (1) and (2):

It can be clearly seen that:

$\angle DFE = \angle E =90-\dfrac{y}{2}$

The two angles of $\triangle EDF$ are equal hence $\triangle EDF$ is isosceles.

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3 years ago

63 is 90% of what number in a number line

lisov135 [29]

If you're trying to say what's 90% of 63, you divide 63 by 10 which is 6.3 then times by 9 which is 56.7

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3 years ago

(1) The point R is halfway between the -6 and -5 on the number line below and represents the number ____. (Use the hyphen for ne

avanturin [10]

-5.5 is halfway between -6 and -5

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3 years ago

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HELP!!! 3/r = 81Please explain​

HELP!!! 3/r = 81Please explain