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
Genrish500 [490]
3 years ago
7

A motorboat takes 40 minutes to travel 20 miles downstream. The return trip takes 60 minutes. What is the speed of the current?

Mathematics
1 answer:
FromTheMoon [43]3 years ago
5 0
Let b be the speed of the boat, and c be the speed of the current. Then:
20/b+c=2/3 hr
20/b-c=1 hr
2/3b+2/3c=20
b-c=20
Then:
b+c=30
b-c=20
2b=50
b=25 mph
c=5 mph
☺☺☺☺
You might be interested in
I need help with the first one please someone help I don’t get it!
levacccp [35]

Answer:

2.2

Step-by-step explanation:

3 0
3 years ago
Plz help pic is shown I don't know how to do this 7th grade
zaharov [31]
The whole circle is 360 degrees. Fine arts makes up 36 degrees. 36 is 10% of 360. 10% of 250 is 25.
Answer:D, 25 students
4 0
3 years ago
Read 2 more answers
F(1)=-12, f(n)=2f(n-1) <br> find first 4 terms
amid [387]
<h3>First four terms are:   -12, -24, -48, -96</h3>

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

Explanation:

The notation f(1) = -12 tells us that the first term is -12.

The equation f(n) = 2*f(n-1) indicates that we're multiplying the (n-1)th term by 2 to get the nth term. Basically we multiply each term by 2 to get the next term.

-12*2 = -24

-24*2 = -48

-48*2 = -96

So the first four terms are -12, -24, -48, -96.

-----------------------------------

Alternative Approach

f(1) = -12 .... first term

f(n) = 2*f(n-1) ... nth term recursive formula

f(2) = 2*f(2-1) ... plug in n = 2

f(2) = 2*f(1)

f(2) = 2*(-12) ... plug in f(1) = -12

f(2) = -24 ... second term

f(n) = 2*f(n-1) .... resetting for the next computation

f(3) = 2*f(3-1) ... plug in n = 3

f(3) = 2*f(2)

f(3) = 2*(-24)  ... plug in f(2) = -24

f(3) = -48 .... third term

f(n) = 2*f(n-1) ... one more reset

f(4) = 2*f(4-1) .... plug in n = 4

f(4) = 2*f(3)

f(4) = 2*(-48) ... plug in f(3) = -48

f(4) = -96 ... fourth term

We get the first four terms to be -12, -24, -48, -96, which was the same as earlier.

4 0
2 years ago
The dimensions of a box that is a rectangular prism are 3 inches, 4 inches, and 6 inches. What is the length of the diagonal fro
Neporo4naja [7]

Answer:

7.8 in

Step-by-step explanation:

Given:-

- The dimension of rectangular prism:

                                   (3 x 4 x 6) inches

Find:-

What is the length of the diagonal from the point R to point S, to the nearest tenth of an inch?

Solution:-

- We will set up an origin with coordinates ( 0 , 0 , 0 ) at point R. Then the coordinates of point S would be ( 3 , 4 , 6 ).

- Then we will use the distance between two points formula in cartesian coordinate system:

                    Distance = \sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2 + (z_1 - z_2)^2}

Where the coordinates of two points ( x1 , y1 , z1 ) & ( x2 , y2 , z2 ).

- Using R( 0 , 0 , 0 ) & S( 3 , 4 , 6 ), the distance |RS| would be:

                   |RS| = \sqrt{(0 - 3)^2 + (0 - 4)^2 + (0 - 6)^2}\\\\|RS| = \sqrt{ 9 + 16 + 36}\\\\|RS| = \sqrt{61} = 7.81024

- The distance |RS| to nearest 10th of an inch is = 7.8 in  

4 0
2 years ago
PLEASE SERIOUSLY, I REALLY NEED HELP WITH THIS, I ASK YOU PLEASE
nika2105 [10]

Answer:

right now if you were to have a coke depending on the weather is from where you are standing effect how long it will take to melt

Step-by-step explanation:

3 0
2 years ago
Other questions:
  • What are the roots of y = x2 – 3x – 10?
    5·1 answer
  • After Elise deposits $15.50 into her bank account her balance is 325
    5·2 answers
  • In a crazed neighborhood they are replacing the speed limit signs that give the speed in m/s.
    11·1 answer
  • 3x2 = 81<br> b. (x - 1)(x + 1)-9 = 5x<br> C. X - 9x + 10 = 32<br> d. 6x(x - 9) = 29
    14·1 answer
  • Algebra: mrs. Davis spent $120 on lunch for a business meeting. Sandwiches,x, cost $4 and drinks, y, cost $1.50. A) write a func
    5·1 answer
  • Help needed ASAP will give BRAINLIEST not a real test
    15·1 answer
  • What value must replace the "?" in order for this polynomial to be expressed as a difference of squares?
    11·1 answer
  • To graph the equation y = 4x - 6<br> You should start the graph at the point (1<br> )
    15·1 answer
  • Each numbers belongs in a location on the number line
    7·1 answer
  • Solve for x.<br><br> −4/5x+3/10&lt;8/10
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!