Mathematics Middle School

PLEASE ANSWER!! Every second, an elevator either has a 50% chance of going up and a 50% chance of going down. If the elevator starts at floor 15, what is the probability that, after 5 seconds, the elevator is at floor 18?

THANK YOU AND SHOW YOUR WORK PLEASE!

Answers

Answer 1

Answer:

The number of ways to assing 7 floors to 5 passengers is 7⋅7⋅7⋅7⋅7

Step-by-step explanation:

Answer 2

The probability that, after 5 seconds, the elevator is at floor 18 is 16807.

Every second, an elevator either has a 50% chance of going up or a 50% chance of going down.

If the elevator starts on floor 15.

What is the meaning of arrangement?

An act of arranging; state of being arranged

The number of ways to assign 7 floors to 5 passengers is,

We have the arrangements,

= 7⋅7⋅7⋅7⋅7

=16807

To learn more about the arrangement visit:

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Related Questions

help please i guess?

Answers

Answer:

It is the left one.

Step-by-step explanation:

This (<) symbol shows us which number is bigger. In this case, 4.626 is larger than 4.606, so we put this "<"

Answer:

the middle one.

im just guessing

Sai has a garden on the side of his house that will be enclosed with 196 ft. of fencing. The
rectangular plot will be fenced in on all sides except for the side against the house. What
dimensions will maximize the plot of land? What is the maximum area?


PLEASE DO THESE BELOW
-use written and verbal explanination that justifies each step
-Use at least one representation(ex number sentences, diagrams, charts, etc)

Answers

Answer:

49 and 98, with an area of 4802

Step-by-step explanation:

So, let X be one of the sides, and Y be the other
X*Y would be the area of the rectangle since width*length = area, and X is the width and Y is the length
2X+Y would be the perimeter, excluding the wall (since we don't need fencing for the side sticking to the wall)

To find the max area, we can plot our two equations
so, our two equations:
1. 2X+Y=196 (since perimeter)
2. X*Y=area, and we're trying to maximise it
We can re-arrange the first equation to get
3. Y=196-2X
plug our new equation (#3) into the second equation(#2)
to get:
X*(196-2X)=area=196X-[tex]2X^2[/tex]
And now that we have this equation, we can either:
Graph it to see the largest area (the highest point)
Or calculate the max area using calc
We have a quadratic function that goes up, then down as X increases, so we'll try to find the point where the function stops going up, and instead goes down as X increases (image is attached, not to scale). Recall that the  first derivative basically tells is the slope of a function/equation at a given X, so when the function is at a slope of 0, we know that the area is at its max point.
Take the first derivative
(196X-2X^2)'=196-2(2X)=196-4X
196-4X is the equation of the slope, so when X = 49, then the slope is 0
This means that one of the side lengths should be 49
To find out which one, we can use trial and error: (there are 2 cases)
1. 49*((196-49)/2)=3601.5
or:
2. 49*(196-2*49)=4802
The second option is correct since the number, or the area is larger.
Side length 1: 49
Side length 2: (196-2*49), or 98

Note: there's definitely another way to do this problem

5 tons of mulch cost $37,800.00. What is the price per pound?

Answers

Answer:

$3.78 per pound

Step-by-step explanation:

5 tons = 10,000 lbs

37,800/10,000 = 3.78

378000/5= 7560 each pound of mulch cost $7560

Please Help! You will get brainliest as long as it is correct!

Answers

Answer:

Casey's snack mix is slightly cheaper per ounce.

Step-by-step explanation:

Divide the total price per box by the amount of ounces. This results in:

- Kim's snack mix costing $0.16 per ounce.

- Casey's snack mix costing $0.14 per ounce.

Therefore, by $0.02, Casey's snack mix is cheaper even though the total price is higher due to having more mix.

PLS HELP! 15 POINTS!

Answers

Answer:

297

Step-by-step explanation:

3*3*3*11=297

How you find the area is by multiplying all of the sides

First, you have to find the areas of the individual shapes. Then you add all the areas together! Here is how you solve it :)

What is the volume of a hemisphere with a diameter of 7.6 m, rounded to the nearest tenth

Answers

Answer:

112.9 cubic meters

Step-by-step explanation:

Formula for Sphere: (4/3) * π*r*3

Since the hemisphere is half of the sphere, plug in variables and multiply.

Please help it’s a math question!!

Answers

Answer:

pentagon, octagon and heptagon.

Step-by-step explanation:

pentagon - five sides

hexagon - six sides

heptagon - seven sides

octagon - eight sides

quadrilateral - four sides

nonagon - nine sides

In this question, we have three polygons: pentagon, octagon and heptagon. (in order from left to right)

Hope this helps!

What is the distance from the shore to the waterfall in the image of the koi pond shown below? All measurements are in yards. Round to the nearest hundredth if needed.
3 yards
99.72 yards
13.8 yards
6.43 yards

Answers

Answer:

6.43 yards

Step-by-step explanation:

a²+b²=c²

x²+5.4²=8.4²

x²+29.16=70.56

-29.16 -29.16

x²=41.4

x=6.43

Answer: D, 6.43 yards

Solve each equation. Show your work, 1. 5(y + 2/5) =-13

Answers

Answer:

-3

Step-by-step explanation:

5(y+2/5)=-13

5(y+0.4)

5y + 2 =-13

5y=-13+2

5y=-15

y=-15/5

y=-3

5(-3+2/5)=-13

What is the surface area of this complex figure?

Enter your answer in the box.

ft²

Answers

Answer:

a = side length a

b = side length b = bottom triangle base b

c = side length c

h = height of prism

H = height of bottom triangle

V = volume

Atot = total surface area = all sides

Alat = lateral surface area = all rectangular sides

Atop = top surface area = top triangle

Abot = bottom surface area = bottom triangle

Step-by-step explanation:

Answer:

792ft²

Step-by-step explanation:  

Have a blessed day

I hope this helps

God bless

What is the measure of Angle B from the diagram below:

Answers

Answer:

201

Step-by-step explanation:

help me pleeeeeeeeeeeeeeeease

Answers

Answer:

n ≥ 29

She needs to do more than 29 pushups on the sixth day.

Step-by-step explanation:

First, we need to use the formula for finding the average. We currently have numbers for the first 5 days.

(22+26+21+25+27+n)/6 = 25

Multiply both sides by 6.

25*6 = 150

150-27-25-21-26-22=x

x=29

Since it is an inequality, Sarah needs to do more than 29 pushups on the sixth day.

Alan is decorating for a party. He wants one color of streamer, one type of flower,
and one color of tablecloth.
● The streamers can be red, blue, or yellow.
The flowers can be tulips, daisies, or roses.
● The color of the tablecloth can be plaid, striped, or solid.
How many possible combinations are there?

Answers

Answer:

OK I think that their is 9 options

Step-by-step explanation:

1.(red,tulips,plaid)  2.(red,daisies,striped)   3.(red,roses,solid)  

4 .(blue,tulips,plaid)   5.(blue,daisies,striped)  6.(blue, roses,solid)  7.(yellow,tulips,plaid)  8.(yellow, daisies,striped)   9.(yellow, roses, solid)

Hope this somewhat helps  :)

Pls Help..............

Answers

Answer:

12

Step-by-step explanation:

V = l*w*h
V = 4*1.5*2
V = 12

Hope this helps :)

Pls help me with this

Answers

Answer:

Library A: 1500 books

Library B: 900 books

Library C: 3250 books

Library D: 750 books

Library E: 3000 books

From GREATEST to LEAST

Library C, Library E, Library A, Library B, then Library D

E,A,C,D,B are the answered to this

A __________ is the amount of energy needed to raise the temperature of one __________ of water, ________ degree celcius.

Write the correct words for those missing above (there are two possible correct answers).

Your answer:

Answers

Answer:

calorie, gram, 1

Step-by-step explanation:

this is what I know, good luck:)

I think this is meant to be specific heat capacity
Specific heat capacity is the amount of energy required to raise the temperature of 1kg of one degree of any substance ( including water) by one degree Celsius
Hope this helps xx

This figure represents a specialty design for a craft template, made of a square and two identical triangles.

What is the area of 4 of these designs?


108 cm²

135 cm²

432 cm²

540 cm²

Answers

Answer:

540 cm²

Step-by-step explanation:

Area of the figure

2 x 1/2 x 9 x 6 + 9 x 954 + 81135 cm²

Area of 4 figures

Area of the figure x 4135 x 4540 cm²
The answer is D - 540 cm2

(25 POINTS) Parallel lines m and n are cut by a transversal t. Which two angles are NOT corresponding angles?
A. 1 and 6
B. 4 and 8
C. 3 and 7
D. 1 and 5

Answers

Answer: A

Explanation: 1 & 6 has different angle measurements. 6 is obviously bigger than 1 if we properly look at it.

Answer:

Answer is A.

Step-by-step explanation:

A small business spent $23,000 for taxable items last year. The tax was 9.5%. How much did the small business pay in taxes last year?

step by step please!!!!!!

Answers

answer: $2,185

to find the amount the business paid in taxes, you have to find 9.5% of $23000

9.5% is 0.095 as a decimal

multiply 23000 by 0.095 to get 2185

therefore, the business paid $2,185 in taxes last year

hope this helps!
They paid $2,185 for taxes last year

coach loren wants one number to describe how all of the values in the data set vary, so Kerry should tell her to use a measure of ______


a. center

b. quantity

c. distribution

d. variation

e. correlation

Answers

Answer:

variation?

Step-by-step explanation:

help me with this please

Answers

Answer:

27720cm

Step-by-step explanation:

to find area, we multiply all the widths.

11×14×20×9= 27720cm

Answer:

235 square centimeters

Step-by-step explanation:

Split The Shape Into 2.

Shape 1: 11 cm by 14 cm

11 cm * 14 cm = 154 square centimeters

Shape 2: (20 - 11) cm by 9 cm

(20 - 11) cm * 9 cm = 9 cm * 9 cm = 81 square centimeters

Original Shape = Shape 1 + Shape 2

154 + 81 = 235 square centimeters

Jenny is studying the growth of a particular type of plant. She is testing the effects of three growth factors: lighting, age, and temperature. Here are the levels she's testing for each.
Growth factor Levels
Lighting Low, Medium, High, Very high
Age month, months, months, months, months
Temperature , , ,
She wants to find the number of ways of combining one level from each of the growth factors. How many ways are there?

Answers

Answer:

80

Step-by-step explanation:

For these types of counting problems, just multiply all of the levels.

For example, this would be

4 choices

5 choices

4 choices

Multiply 4*5*4, and you get 80.

Total number of ways of combining one level from each of the growth factors is equals to 80.

What is fundamental principle of counting?

" As per fundamental principle of counting if first event has 'm' number of possible outcomes , second has 'n' number of possible outcomes then total number of ways are m× n ."

According to the question,

Number of growth factors =3

First growth factor: Lightening

Second growth factor: Age

Third growth factor : Temperature

As per the data given we have,

Number of levels in lightening 'm'= 4

Number of levels in age 'n'= 5

Number of levels in temperature 'p' =4

Substitute the value as per the definition of fundamental principle of counting

Total number of ways = m × n × p

                                     = 4 × 5 × 4

                                     = 80 ways

                                         

Hence, total number of ways of combining one level from each of the growth factors is equals to 80ways.

Learn more about fundamental principle of counting here

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#SPJ2

At a pizzeria one day, 12 of the pizzas sold were topped with mushrooms. This represented 15% of all the pizzas sold that day. What was the total number of pizzas sold that day?

Record your answer in the grid. Be sure to use the correct place value.

Answers

Answer:

80

Step-by-step explanation:

So, let's say the total number of pizzas is x

If 15% of x, the total, is 12, then x * 0.15 must = 12

Use this to make an equation

12 = 0.15x

Divide both sides by 0.15 to get x on its own

12 / 0.15 = x0.15 / 0.15

80 = x

80 pizzas were sold

Rectangle QUAD has coordinates​ Q(0,0), ​U(0,3​), ​A(6​,3​), and ​D(​6,0). ​Q'U'A'D' is the image of QUAD after a dilation with center​ (0,0) and scale factor 6. What are the coordinates of point D​'?

Answers

Answer:

Step-by-step explanation:

Since the dilation is centered at the origin, we can multiply each of the coordinates by the scale factor. This gives us that D'(36,0).

Stevie is moving up to the attic and wants to paint a wall white. The wall is a triangle with a base of 20 feet and a height of 21 feet. What is the area of the wall?

Answers

Area = L x H .

Answer - 420 ft

Answer:

Step-by-step explanation:

Remark

Use the formula for the Area of a Triangle to find the number of square feet the paint will have to cover.

Formula

Area = 1/2 base * height

Givens

b = 20 feet

h = 21 feet

Solution

Area = 1/2 * 20 * 21

Area = 1/2 * 420

Area = 210 square feet

Two fifths of the 40 students earned an A, what percent of the students earned an A

Answers

Answer:

40%

Step-by-step explanation:

2/5 = 0.4 or 40% (2 x 2 = 4, 5 x 5 = 10)

Therefore 40% of the students earned an A.

2/5*100=40 so your answer is 40%

9x + 7 ≥ 54

x ≥ __

Solve pls

Answers

Answer:

5 2/9 would be the answer

5 2/9 is the answer

Im stuck on this one question

Answers

Answer:

8x+6 is less than or equal to 42

Step-by-step explanation:

Answer:

e

Step-by-step explanation:

Cameron pays $6 to rent shoes.

Cameron pays $8 per game.

Cameron has a limit of $42.

Expression: 8x + 6 [tex]\leq[/tex] 42

Cameron must spend less than or equal to $42.

hope this helps :)

Screenshot attached please help i need the answer quickly there are 2 problems so please solve all of them

Answers

Answer:

Pink: 48 units sq

Blue: 42 units sq

Step-by-step explanation:

Area of a trapezoid: A=(h)(a+b)/2. To see where h, a, and b are located, see the reference image below. Always remember that a is the shorter end and b is the longer end. Since each grid mark goes by 2, we can use the graph to find the missing variables.

PINK trapezoid:

h = 8, a = 4, b = 8A = 8(4 + 8)/2 = 48 units squared

BLUE trapezoid:

h = 6, a = 4, b = 10A = 6(4 + 10)/2 = 42 units squared

Hope this helps!

hi i need help can somebody answer this question and give an explanation

Answers

Answer:

0.30

Step-by-step explanation:

Each marker costs 30 cents each (0.30$)

you have to divide the amount of money (6) by the amount of markers (20)

6 ÷ 20= 0.30

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