A handbag contains seven coins and three
keys. Two items are taken out of the handbag
one after the other and not replaced. Find
the expected number of keys taken out of the
handbag

Answers

Answer 1

Answer:

0.59998

Step-by-step explanation:

Number of keys = 3

Number of coins = 7

Total = 10

Number of items taken out = 2

Expected number of keys taken out:

Let x = Number of keys taken out

X = 0

1st pick = 7/10

2nd pick = 6/9

7/10 * 6/9 = 0.46666

X = 1

(7/10 * 3/9) + (3/10 * 7/9) = 0.46666

X = 2

(3/10 * 2/9) = 0.066666

X : ____ 0 ______ 1 _______ 2

P(X): _0.46666__0.46666 _0.06666

Expected value :

(0*0.46666) + (1*0.46666) + (2*0.06666)

= 0.59998


Related Questions

multiply -24, and add -10

Answers

-12 and 2

-12×2= -24

-12+2= -10

can you solve this? what is sin 60

Answers

Answer:

Yo the answers B

3/2

Step-by-step explanation:

What is the value of x?

Answers

I’m guessing 45

Hope it helps

Enlarge the triangle by scale factor -2, using point (8,8) as the centre of enlargement
(please hurry 15 points)

Answers

you need to draw a line from each corner of the triangle to the dot at 8,8 to start

Answer:

I understand you probably don't need this anymore but here is the answer anyway.

Step-by-step explanation:

So what you want to do is draw a line from a corner to the centre of enlargement (I'll use the one at (9, 10) ). Then you see that it take 2 boxes to get to that, keep the line going through for double as much as it took to reach the centre of enlargement, this is because the scale factor is two. Do this for every corner, going through the centre of enlargement for the double the length it took to get to it (plot a cross at each bit you end up). Finally, remove the lines you used and connect the crosses. This method may be a bit confusing and someone who understands it more than me would probably explain what the minus means, if I explain it will probably make this more confusing. Hope this Helps!

Sita bought a sofa set for Rs 30,000 and a dining set for Rs 20,000. He sold the sofa set at a loss of 5% but made a profit of 5% on the dining set. The net result of the transaction is?

Answers

Answer: See explanation

Step-by-step explanation:

Sita bought a sofa set for Rs 30,000 and sold the sofa set at a loss of 5%. The loss on the sofa will be:

= 5% × 30000

= 5/100 × 30000

= 0.05 × 30000

= 1500

Selling price of the sofa = 30000 - 1500 = 28500

Sita bought a dining set for Rs 20,000 and made a profit of 5% on the dining set. The selling price of the dining set will be:

= 20000 + (5% × 20000)

= 20000 + (0.05 × 20000)

= 20000 + 1000

= 21000

The cost price of the sofa and dining set will be:

= Rs 20000 + Rs 30000

= Rs 50000

The selling price of the dining set will be:

= Rs 28500 + Rs 21000

= Rs 49500

The net result of the transaction is will be:

Selling price - Cost price

= 49500 - 50000

= -500

There's a net loss of $500


The length of one base of a trapezoid is 19 meters and the length of the median is 23 meters. Find the length of the other base,

Answers

Answer:

27

Step-by-step explanation:

19+x/2=23

19+x=46

x=27

or 19-23=4

23+4=27

The length of the other base of the trapezoid is 27 meters.

What is a Trapezoid?

A trapezoid is a polygon with four sides, it has one pair of parallel sides.

The length of the base of a trapezoid is 19 meters.

The length of the median is 23 meters.

The median in a trapezoid is a line that is in the drawn in the mid way of the two non-adjacent sides.

The value of median is half of the bases added together.

Median = (1/2) ( Base₁ +  Base₂)

Substituting the values in the formula to obtain the value of the other base.

Let x be the length of the other base,

23 = (1/2) * ( 19 + x)

23 *2 = 19+x

46 = 19 +x

x = 27 meters

The length of the other base is 27 meters.

To know more about Trapezoid

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#SPJ5

HELPPPPP !!!!!!! Please answer correctly Will mark Brianliest !!!!!!!!!!

Answers

The coordinates of B would be (-1, -3)

DIRECTIONS: BELOW ARE NUMBERS EXPRESSED IN EXPONENTIAL NOTATION. GIVE THE VALUE OF EACH EXPONENTIAL NOTATION.

1. 4³ =
2. 6⁴ =
3. 25 =
4. 5² =
5. 3⁴ =

Answers

Answer:

1) 4 × 4× 4 = 64

2) 6⁴ = 1296

3) 25 = 25

4) 5² = 2

3) 3⁴= 81

Which Graph Matches The Table?

Answers

Answer:

graph W

Step-by-step explanation:

That answer for It would be W

Of the questions on his math test, Shane answered 42 correctly and 18 incorrectly. What percent of the total questions did Shane answer correctly?​

Answers

Answer:

She answered 70% of the questions correctly.

Given ABC, what is the value of x?
HELP ME PLS THIS IS URGENT

Answers

Answer:

x=35

Step-by-step explanation:

We know that sum of angles in a triangle=180

120

o

+25

o

+x=180

145

o

+x=180

o

x=35

o

hmm i sure do ask a lot of questions

Answers

Answer:

A bc it show that it travels 25 miles to the hour.

In other words Miles per hour= 25 to 1 hour

Step-by-step explanation:

Hope this helps :)

A bc the other ones literally make no sense lol

Steph makes scones in three flavours: cheese, fruit and plain.

She makes:

• 4 times as many fruit scones as cheese scones,

• 3 times as many plain scones as cheese scones.

She sells each scone for the same price.
She makes a total of £96 from the sale of all the scones.

How much does she make from the sale of the plain scones?

Answers

Answer:

The amount she makes from the sale of plain scones is £36

Step-by-step explanation:

The number of flavors of scones Steph makes =

The number of fruit scones she makes = 4 × The number of cheese scones she makes

The number of plain scones she makes = 3 × The number of cheese scones she makes

The price at which she sells the cheese scones = The price at which she sells the fruit scones

The price at which she sells the cheese scones = The price at which she sells the plain scones

The total amount she makes = £96

Let, 'x', represent the number of cheese scones she makes

Therefore, we have;

The number of fruit scones she makes = 4·x

The number of plain she makes = 3·x

∴ The total number of scones she makes = 4·x + 3·x + x = 8·x

The total number of scones she makes = 8·x

The total amount she makes from selling the 8·x scones she makes = £96

∴ 8·x = £96

x = £96/8 = £12

The amount she makes from the sale of 'x' number of scones = £12

The number of plain scones she makes = 3·x

From the sale of '3·x' number of plain scones, she makes = £12 × 3 = £36

Rachel used 18 centimeters of tape to wrap 6 presents. How much tape will Rachel need in all if she has to wrap 15 presents? Solve using unit rates.

centimeters

Answers

Answer:

Rachel would need 45cm of tape to wrap 15 presents.

Step-by-step explanation:

Firstly we need to find how much is required to wrap one presnt: 18÷6=3.3cm of tape is needed to wrap one present.

Secondly to find how many she needs to wrap 15 we sinply multiply 15 by three and get 45.

I hope this helps you in any way.

PLEASE HELP!!!
Paula can spend no more than $500 for a photographer to take specialty photos for the dinner. Aerial photos from a drone cost $25 each, and wide-angle photos cost $50 each. Part A Write an inequality that represents the number of each type of photo that Paula can buy. Let x equal the number of aerial photos and y equal the number of wide-angle photos.

Answers

Answer:

25x + 50y <= 500

evaluate the expression3+(a+4)(8-b) when a = 5 and b = 6

Answers

Answer:

21

Step-by-step explanation:

3+(a+4)(8-b)

3+(5+4)(8-6)

3+(9)(2)

3+18

21

Helppp Bc I don’t know what to do

Answers

Answer:

Option (b) will be the correct answer.

Step-by-step explanation:

190×10⁸

1.9×10²×10⁸

1.9×10¹⁰

Answer:

B

Step-by-step explanation:

190 x 10^8 = 19000000000

1.9 x 10 ^10= 19000000000

Calculate the volume of liquid that would fill the bowl of the glass. Show all your work.

Answers

Answer:

52.36

Step-by-step explanation:

Formula to find volume in a cone is

V = pi • radius^2 h/3

So we fill in the numbers

V = pi •

the radius is half of diameter,

The diameter is 5

So it's

V = pi • 2.5

since it's half of 5

V = pi • 2.5^2 h/3

the height is 8 so we fill it in

V = pi • 2.5^2 8/3

When calculated, you get..

52.36

The volume of the liquid which can fill the bowl of the glass (in shape of cone) with the liquid is 49.74 cm³.

What is of volume of solid?

Volume of solid is the amount of quantity, which is obtained by the solid or object in the 3 dimensional space.

The volume of the cone can be given as,

[tex]V=\dfrac{1}{3}\pi r^2\sqrt{l^2-r^2}[/tex]

Here, (r) is the radius of the base of the cone and (l) is the slant height of the cone.

Here, the diameter of the cone is 5 cm. thus the radius of the cone is,

[tex]r=\dfrac{5}{2}\\r=2.5\rm cm[/tex]

The slant height of the cone is 8 cm. Thus, put the value to find the volume of cone as,

[tex]V=\dfrac{1}{3}\pi (2.5)^2\sqrt{(8)^2-(2.5)^2}\\V\cong 49.74\rm cm^3[/tex]

Thus the volume of the liquid which can fill the bowl of the glass (in shape of cone) with the liquid is 49.74 cm³.

Learn more about the volume of solid here;

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what shape is similar to the original shape

Answers

Answer c

Step-by-step explanation:

they have to be equivalent

Kathy is making 3 batches of pancakes for a brunch party. If each batch needs 1712 cups of milk, how much milk does she need altogether?

Answers

Answer:

5,136

Step-by-step explanation:

because 1,712×3=5,136

Simplify the expression

Answers

Answer:
x^35

Explanation:
5 x 7 = 35

Answer:

x12

Step-by-step explanation:

(x*x*x*x*x) *(x*x*x*x*x*x)

The sum of the digits of a two-digit
number is 12. If the digits are interchanged,
the number is increased by 36. Find the
number​

Answers

Answer:

48

Step-by-step explanation:

x+y=12

y=12-x

10y+x =10x+y +36

9y-9x=36

108-9x-9x=36

-18x=-72

x=4

y=8

HURRY
What is the name of the figure?
triangular prism
O triangular pyramid
O rectangular prism
O rectangular pyramid

Answers

Answer:

rectangular pyramid

Step-by-step explanation:

1. Does this equation represent growth or decay?
A (t) = 800(1.21)

Answers

Answer:Decay

Step-by-step explanation: because of perenthesis

The equation represents decay

PLEASE HELP MEEEEEEEE

Answers

Answer: 4.19

v = 4/3 * 3.14 * 1^3

v = 4/3 * 3.14

v = 4.19

The cost C (in dollars) of making n watches is represented by C = 15n + 85 .

How many watches are made when the cost is $385?

how many watches?

Answers

So the answer should be 48.58 if not then it could be 278n

Giving brainliest to whoever comments the right answer first

Answers

Answer:j

Step-by-step explanation:

A rock was thrown from the top of a building. The distance, in feet, between the rock and the ground t seconds after it is thrown is represented by d=-16t squared -4t+382. How long after the rock is thrown is it 370 feet from the ground

Answers

Answer:

Step-by-step explanation:

Phil is riding his bike. He rides 25 miles in 2 hours, 37.5 miles in 3 hours, and 50
miles in 4 hours. Find the constant of proportipnality and write an equation to
describe the situation. Let x represent the number of hours.
The equation that describes the relationship is y =

Answers

The constant of proportionality (known as "speed" in this case) is 12.5 miles per hour.

The equation is  

d

=

12.5

×

t

Explanation:

To find the constant of proportionality, divide one value in each pair by the other. If this relationship is a true direct proportionality , when you repeat these for every pair, your will come up with the same value:

For example

25

miles

÷

2

hours

=

12.5

miles

hour

A direct proportionality will always result in an equation that resembles this:

y

=

k

x

where  

y

and  

x

are the related quantities and  

k

is the constant of proportionality. If you draw a graph using the values you have, the graph will show a straight line the passes through the origin. The slope of this line will be the constant of proportionality. (And if the values given are real physical quantities, this constant will contain important information about the situation you are studying!)

Find the value of x.

Answers

Answer:

i forget im sorry

Answer:

find the value of x

20

40

Step-by-step explanation:

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