1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alla [95]
3 years ago
8

A person swims 11 miles downstream in the same time they can swim 7 miles up stream. The speed of the current is 4 miles per hou

r.
These situations can be represented by the equations
Downstream: t=11/s+4 Upstream:t=7/s-4,
where t stands for time and s is the speed of the swimmer. What is the speed of the swimmer swimming in still water?
Mathematics
1 answer:
Natali [406]3 years ago
7 0

Answer:

s = 18 mph

Step-by-step explanation:

At downstream, time is; t = 11/(s+ 4)

At upstream, time is; t = 7/(s - 4)

Since they both are passed in the same time, then ;

11/(s+ 4) = 7/(s - 4)

Cross Multiply to get;

11(s - 4) = 7(s + 4)

11s - 44 = 7s + 28

11s - 7s = 44 + 28

4s = 72

s = 72/4

s = 18

You might be interested in
I need helpppp (10 points )
irga5000 [103]

Answer:  The flagpole is about 22.3 feet tall.

This is roughly the size of a two story building, assuming each floor is 10 feet or so.

Since this height is under 25 ft, this flagpole is in compliance with the regulation.

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

Work Shown:

The horizontal leg of the triangle is 36 ft. This is the adjacent leg to the reference angle 25 degrees.

The vertical leg of the triangle is x-5.5, and this leg is the opposite side to the reference angle 25 degrees.

Use the tangent rule to connect the opposite and adjacent sides.

Solve for x.

tan(angle) = opposite/adjacent

tan(25) = (x-5.5)/36

36*tan(25) = x-5.5

x-5.5 = 36*tan(25)

x = 36*tan(25)+5.5

x = 22.28707569358

x = 22.3 ft is the approximate height of the flagpole

Make sure your calculator is in degree mode.

The height is not over 25 ft, so this flagpole meets the requirements.

4 0
3 years ago
Geometry help please. Thank you. I picked C but that answer is wrong. What term Describes RT?
Fiesta28 [93]

Answer:

angle bisector

Step-by-step explanation:

RT is an angle bisector of the triangle

6 0
3 years ago
Write 7,380,000,000 in scientific notation.
uysha [10]
7.380 times 10 to the 9th power (or 7.38 times 10 to the 9th power)
5 0
3 years ago
Read 2 more answers
Convert rectangular equation to polar equation
miss Akunina [59]

y= 2*x / x+3 that is my answer

4 0
3 years ago
Sofia has four times as many dollars as her friend jessie has. together the two have $35. how much money do they each have?
garik1379 [7]
4J = s
J + s = J + 4j = 5j = 35

J = 7
s = 28
3 0
3 years ago
Other questions:
  • Evaluate 2D + 3 when d = 8.
    5·1 answer
  • What is the simplified expression for -3(2x-7)+2y+ 2(x+y)?
    8·1 answer
  • Can someone help please
    13·1 answer
  • What is the least common muliple of 5 and 6
    9·2 answers
  • Please help ASAP pLEASE
    5·1 answer
  • Find the product and write in lowest term. Give me an integer or simplified fraction.<br> 7/54×27/35
    5·1 answer
  • Does anyone know the answer?
    9·2 answers
  • 257 sci cu grau si 97 saci cu porumb cantaresc 14.480,iar 349 saci cu grau si 97 saci cu porumb cantaresc 18.344 kg.Sa se afle c
    8·1 answer
  • In ΔABC, the measure of ∠C=90°, the measure of ∠B=15°, and BC = 2.8 feet. Find the length of CA to the nearest tenth of a foot.
    6·1 answer
  • Which expressions are equivalent to 2(4f + 2g)?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!