3 years ago

90 is the produ t of donnies savings and 6.

Mathematics

2 answers:

goblinko [34]3 years ago

7 0

U need to add them .

notsponge [240]3 years ago

6 0

You need to add more context im afriad

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8. There are 10 balls in a bag numbered from 1 to 10. Three balls are selected at random without replacement.

PIT_PIT [208]

Answer:

a. 720

b. 0.3

Step-by-step explanation:

Three balls are selected at random without replacement.

First ball can be selected in 10 ways

Second ball can be selected in 9 ways

Third ball can be selected in 8 ways

Thus, there are 10×9×8 =720 different ways of selecting three balls.

There are three cases that satisfy this condition

first ball picked is 5, the others are not
first ball is not 5, second is 5, third is not
first and second ball is not five, third ball is 5

Each probabilities are:

$\frac{1}{10} * \frac{9}{9} *\frac{8}{8} =\frac{1}{10}$
$\frac{9}{10} *\frac{1}{9} *\frac{8}{8} =\frac{1}{10}$
$\frac{9}{10} *\frac{8}{9} *\frac{1}{8} =\frac{1}{10}$

Thus, one of the balls selected is the number 5 is then $\frac{1}{10} + \frac{1}{10} + \frac{1}{10} = \frac{3}{10}$

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3 years ago

How do you know (2,1) is a solution to 4x +y=9

VARVARA [1.3K]

4x+y=9

4(2)+(1)=9

8+1=9

9=9

It is a solution

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3 years ago

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Sven has 11 more than twice as many customers as when he started selling newspapers. He now has 73 customers. How many did he ha

Andre45 [30]

Answer:

31 customers

Step-by-step explanation:

Let he had x customers when he started,

given that, 2x+11=73

=>2x=62.. Subtracting 11 from both sides

=> x=31 ...Dividing both sides by 2

Hence he had 31 customers when he started.

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