A 5.5-foot-tall woman walks at 8 ft/s toward a street light that is 22 ft above the ground. What is the rate of change of the length of her shadow when she is 20 ft from the street light? At what rate is the tip of her shadow moving?

Answers

Answer 1

Answer: [tex]\frac{8}{3}\ ft/s[/tex]

Step-by-step explanation:

Given

length of shadow =22 ft

height of woman =5.5 ft

speed of woman [tex]\frac{dy}{dt}=8\ ft/s[/tex]

from the figure, we can write

[tex]\frac{22}{x+y}=\frac{5.5}{x}[/tex]

at given instant

y=20 ft

so, using similar triangle properties

[tex]\frac{22}{x+20}=\frac{5.5}{x}\\22x=5.5x+110\\16.5x=110\\x=6.67\ ft[/tex]

Again we can write

[tex]\dfrac{22}{x+y}=\dfrac{5.5}{x}\\22x=5.5x+5.5y\\16.5x=5.5y\\3x=y\\\text{differentiate w.r.t time} \\3\frac{dx}{dt}=\frac{dy}{dt}\\\frac{dx}{dt}=\frac{1}{3}\times 8=\frac{8}{3}\ ft/s\ \text{away from the woman}[/tex]

A 5.5-foot-tall Woman Walks At 8 Ft/s Toward A Street Light That Is 22 Ft Above The Ground. What Is The

Related Questions

The number of gallons used to wash dishes varies directly with the number of loads. If it takes 65 gallons to wash 5 loads. How many gallons would be needed to wash 3 loads?

Answers

Answer:

13 gallons

Step-by-step explanation:

Answer:

39 gallons

Step-by-step explanation:

We would use a simple relation here

65 gallons washes 5 loads, then

65/5 gallons will wash one load

13 gallons washes one load

Now, to find 3 loads will be

13 * 3 gallons = 39 gallons

On a​ map, an art gallery is located at (13,-3). A car wash is located at(13,-5) . If each unit on the map is a city​ block, how many city blocks is the art gallery from the​ museum?

Answers

Answer:

The art gallery is 2 city blocks from the car wash

Step-by-step explanation:

If the x-coordinates of two points on a line equal, then the line is a vertical lineThe length of a vertical segment whose endpoints are (x, y1) and (x, y2) is Iy2 - y1I

Let us solve the question

∵ The art gallery is located at the point (13, -3)

x1 = 13 and y1 = -3

∵ A car wash is located at (13, -5)

x2 = 13 and y2 = -5

x1 = x2 = 13

→ That means the gallery and the car wash located vertically over each other

∴ The distance between them = Iy2 - y1I

∵ y1 = -3 and y2 = -5

∴ The distance between them = I-5 - (-3)I

∴ The distance between them = I-5 + 3I

∴ The distance between them = I-2I

→ Remember the absolute value cancel the negative sign

The distance between them = 2 units

Each unit on the map is a city​ block

∵ The distance between them is 2 units

→ That means the vertical distance between them is 2 city blocks

The art gallery is 2 city blocks from the car wash

A recipe for cake used 3 1/3 cups of flour. Audre has 12 1/12 cups of flour. What is the most number of cakes she can make?​

Answers

Answer:

3 cakes.

Step-by-step explanation:

12 1/2 divided by 3 1/3 gives you 3.625, then you round it off to 3.

Answer:

3 cakes hope this helps :)

scientists give two different treatments to people who have the flu and determine if their health improved. The results for the test are in the two-way table.

What percentage of people receiving treatment 1 had improved health?

What percentage of people receiving treatment 2 had improved health?

Answers

Answer:

58

Step-by-step explanation:

thank me later

The percentage of people receiving treatment 1 had improved health is 48%. The percentage of people receiving treatment 2 had improved health will be 52%.

What is the percentage?

The percentage is defined as representing any number with respect to 100. It is denoted by the sign %. The percentage stands for "out of 100." Imagine any measurement or object being divided into 100 equal bits.

Given that scientists give two different treatments to people who have the flu and determine if their health improved. The results of the test are in the two-way table.

The percentage of people receiving treatment 1 had improved health is calculated as,

Percentage = 23 / ( 23 + 25 )

Percentage = 0.48 x 100 = 48%

The percentage of people receiving treatment 2 had improved health is calculated as,

Percentage = 25 / ( 23 + 25 )

Percentage = 0.52 x 100 = 52%

Therefore, the percentage of people receiving treatment 1 had improved health is 48%. The percentage of people receiving treatment 2 had improved health will be 52%.

To know more about percentages follow

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Read the caption! And pls help me :))

Answers

Answer:

ASA

Step-by-step explanation:

If 2 angles and the included side of one triangle are congruent to 2 angles and the included side of the other triangle, then the triangles are congruent.

The included side is the side between the vertices of the 2 triangles.

Here

∠ S = ∠ W ( 1 angle )

∠ R = ∠ X ( 2 angles )

RS = XW ( side between the 2 angles )

Thus the 2 triangles are congruent by the ASA postulate

Select the correct answer from each drop-down menu.

1_____ × 10-3 is 2,000 times greater than 1.9 × 10-6. It is also
2_____ times greater than 9.5 × 10-4.

Answers

Answer:

Well, 1 is 3.8 The second one is 40,

Step-by-step explanation:

I believe 1 is 3.8, b/c 1.9*2 is 3.8, and the difference between exponents makes 3 zeros, so 2000.

The second one is 40, I confirmed this by doing .0001 to replicate 10 to the negative 4th power

By doing 9.5*.0001*40, I got the 0.038 from 1

Answer:

3.8 × 10-3 is 2,000 times greater than 1.9 × 10-6. It is also 4 times greater than 9.5 x 10-4.

Step-by-step explanation:

I started by doing 0.0000019 x 2000 and got 0.0038. If you move the decimal point 4 over you get 3.8.

EVERYONE ELSE IS WRONG!!! I got this correct on the test after retaking it, the second one is NOT 40 it is 4.

Which type of association does the scatter plot show?

Answers

Answer:

Strong positive

Step-by-step explanation:

I had that question on a test

Answer:

so what was the answer

Step-by-step explanation:

Keisha makes a large sandwich for a family picnic. She takes
1\2

of the sandwich to the picnic. At the picnic, her family eats
1/4
of the whole sandwich.

What fraction of the whole sandwich does Keisha bring back from the picnic?

I will brainliest Please

Answers

Answer:

3/4 becuae fractions if u have 1/2 which is like 50% and take 25% of it u have only 25% left

Solve for X (This should be easy)

Answers

Answer:

17

Step-by-step explanation:

15^2+8^2=17^2

please help me i will mark brainliest!!! Rewrite as a simplified fraction 0.612 also the 12 is repeating

Answers

Answer:

= 68/111

Step-by-step explanation:

[Function Composition] could someone help me with this answers or show work either is fine

Answers

Answer:

(f ○ g)(8) = - 6

Step-by-step explanation:

Evaluate g(8), then substitute the value obtained into f(n)

g(8) = 8 - 2 = 6 , then

f(6) = - 6

Answer:

-62

Step-by-step explanation:

Two functions are given to us , which are ,

[tex]\bf\implies f(n)= -n \\\\\bf\implies g(n)= n - 2 [/tex]

We need to find , ( f • g )(8) . So ,

⇒ ( f • g) = - n ( n - 2 )

⇒ ( f • g) = -n² + 2

(f g) = 2 -

==================================

Substituting n = 8 :-

⇒ ( f • g)(n) = 2 - n²

⇒ ( f • g)(8) = 2 - 8²

⇒ (f • g)(8) = 2 - 64

( f g)(8) = -62 .

Hence the required answer is (-62) .

use the area of a triangle to write a formula for the area of a regular polygon and solve of the formula for height

Answers

Answer:

4

Step-by-step explanation:

Fu Haifeng of China set a badminton world record with a smash of 332 kilometers per hour. A kilometer is about 58 mile.What is the speed in miles per hour, to the closest whole number?

Answers

Answer:

206 miles/hour

Step-by-step explanation:

1 kilometre per hour = 0.621 mile per hour

332 km/hr to miles per hour

= 332 km/hr × 0.621 miles per hour

= 206.295 miles per hour

Approximately to the nearest whole number

= 206 miles per hour

Badminton world record smash speed in miles is 260.17 mile per hour.

Convert into mile per hour:

Given that;

Badminton world record smash = 332 kilometers per hour

1 kilometer per hour = 0.621 mile per hour

Find:

Badminton world record smash speed in miles

Computation:

Badminton world record smash speed in miles = 332 × 0.621

Badminton world record smash speed in miles = 260.17 mile per hour

Find more information about 'mile per hour'.

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simplify this expression 4^5/4^3

Answers

Answer:

It is 4 squared

Step-by-step explanation:

When dividing exponents it’s almost like subtraction so 4^5/4^3 is 4^2

The answer
4^5/4^3 = 4^2 =16


help please i am struggling.

Answers

Answer:

what Netflix show were you watching?

Meteorologists recorded a temperature change from 72˚F to 28˚F in one day. Write an equation that represents how many degrees the temperature fell.

Answers

Answer:

72-x=28 or 72-28=x

Step-by-step explanation:

Can you answer this please

Answers

Answer:

DE = 15 cm, AB = 6 cm

Step-by-step explanation:

Since the triangles are similar then the ratios of corresponding sides are equal.

(a)

[tex]\frac{DE}{BC}[/tex] = [tex]\frac{CE}{AC}[/tex] , substitute values

[tex]\frac{DE}{5}[/tex] = [tex]\frac{24}{8}[/tex] = 3 ( multiply both sides by 5 to clear the fraction )

DE = 15 cm

(b)

[tex]\frac{AB}{CD}[/tex] = [tex]\frac{AC}{CE}[/tex] , substitute values

[tex]\frac{AB}{18}[/tex] = [tex]\frac{8}{24}[/tex] ( cross- multiply )

24AB = 144 ( divide both sides by 24 )

AB = 6 cm

Ar a furniture store, a bed frame costs $440 and mattress costs $654. There are currently 7 bed frames in the store, and together the bed frames and the mattresses are worth $10,820. How many mattresses are in the store?
A.1
B.5
C.12
D.15
A step y step explanation please!

Answers

Answer:

the three angles of a triangle have measures x,2x,and 4y,where x>56.If x and y are integers, what is one possible value of y?

What is the value of the expression below when x=4?

7x^2+8x−7

Answers

Answer:

137

Step-by-step explanation:

when x=4 , We substitute in the above equation

(7 x 4²)+(8x4)-7 = 112+25 =137

Answer : 137

Explanation: basically you plug 4 into the x spots so; 7(4)^2 + 8(4) -7

=7(16) + 8(4) -7

= 112 + 32 - 7

= 144 -7

= 137

Is y=6/x - 2 Linear? Please help :) 10 points!

Answers

Answer:

No this would not be linear. This would be an inverse variation, and doesn't have a linear relation between two variables since there is not constant rate of change or slope.

Tanya runs diagonally across a rectangular field that has a length of 40 yards and a width of 30 yards, as shown in the diagram. What is the length of the diagonal, in yards, that Tanya runs?

Answers

Answer:

70 besarse you have to add

Mara put down 7.5% on the purchase of her new home. If she put down $14.175, find the purchase price of the home

Answers

Given:

Mara put down 7.5% on the purchase of her new home.

She put down $14.175.

To find:

The purchase price of the home.

Solution:

Let x be the purchase price of the home.

According to the question,

Put down = 7.5% of the purchase price of the home.

[tex]14.175=\dfrac{7.5}{100}\times x[/tex]

[tex]14.175=0.075x[/tex]

Divide both sides by 0.075.

[tex]\dfrac{14.175}{0.075}=x[/tex]

[tex]189=x[/tex]

Therefore, the purchase price of the home is $189.

I need help ASAP thanks xd​

Answers

It would be 125 you do 180 minus 55

is 4(x+1) - 3 and 4x + 1 equivalent and why ??

Answers

Answer:

Step-by-step explanation:

4x + 4 - 3

= 4x + 1

Yes they both are equivalent because the algebraic expression is same

Michael giokas car from 150 minutes at a constant speed of 70 miles per hour and then for another 2 hours at a constant speed of 81 miles per hour how far did Michael drive so explain how you got your answer​

Answers

Step-by-step explanation:

150 minutes = 2.5 hours.

2.5 hours * (70 miles/hr) = 175 miles.

2 hours * (81 miles/hr) = 162 miles

Total distance = 175 + 162 = 337 miles.

Hence Michael drove 337 miles in total.

Answer:lek

Step-by-step explanation:

Leo

PLEASE HELP ME I WILL GIVE YOU A BRAINILIST
A six sided die is rolled then a quadrilateral is chosen at random parallelogram ,rhombus, rectangle square and trapezoid. What is the probability of getting five quadrilateral with four congruent sides?

Answers

Answer:

1. Square

2. Rhombus

I hope I helped, if not please let me know and I will correct my answer.

Happy new year, good luck with your future studies.

Step-by-step explanation:

The probability of getting five quadrilateral with four congruent sides is,

⇒ 1 / 3

What is mean by Probability?

The term probability refers to the likelihood of an event occurring. Probability means possibility. It is a branch of mathematics that deals with the occurrence of a random event. The value is expressed from zero to one.

Given that;

A six sided die is rolled then a quadrilateral is chosen at random parallelogram ,rhombus, rectangle, square and trapezoid.

Hence, Total number of outcomes = 6

And, We know that;

Square and Rhombus have four congruent sides.

Hence, Number of possible outcomes = 2

Thus,  The probability of getting five quadrilateral with four congruent sides is,

⇒ 2 / 6

⇒ 1 / 3

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What is the congruence theorem used to prove that the two triangles are congruent?

Answers

Answer:

ASA

Step-by-step explanation

They have a congruent angle at the top of the triangle and they both have a right angle at the bottom. They share the same side, so this is ASA.

Please help me ASAP!!!

Answers

Answer: -5, 5, 9

Step-by-step explanation: Range means y values.

5. A broken rectangular-shaped window is
being replaced. It measures 24 inches by 187
inches. How many square inches of glass are
needed to repair the window? Draw a picture
to help.

Answers

Answer:

4488

Step-by-step explanation:

(24)(187)

For each percentage, find a matching statement to describe it. PLZ HELP!!!

Answers

1. 4
2. 3
3. 2
4. 5
5. 6
6. 1
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