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
Rudik [331]
2 years ago
9

Janelle has 4 hours to spend training for an upcoming race. She completes her training by running full speed the distance of the

race and walking back the same distance to cool down. If she runs at a speed of 7mph and walks back at a speed of 3mph how long should she plan to spend walking back?
Mathematics
1 answer:
natima [27]2 years ago
8 0
If the amount of time taken to go said distance is x and the amount of time taken to go back said distance is y, then the amount of miles total is 7x+3y due to that for every hour, she adds 7 miles when going there and 3 miles for walking back. In addition, since the total amount of time is 4 hours, x+y=4 as the total time spent as well as 7x=3y due to that they're the same distance. 
x+y=4
7x=3y
Dividing the second equation by 7, we get x=3y/7. Plugging that into the first equation, we get 3y/7+y=4=10y/7 (since y=7y/7). Multiplying both sides by 7 and then dividing both by 10, we get 28/10=2.8=y in hours. Since 0.1 hours is 60/10=6 minutes, and 0.8/0.1=8, 6*8=48 minutes=0.8 hours, meaning that she should plan to spend 2 hours and 48 minutes walking back 

You might be interested in
Two-fifths of the students in your class are in the band. Of these, one-fourth play the saxophone.
vichka [17]

Answer:

a. 1/10 b. did not understand question

Step-by-step explanation:

It is as simple as two fifths of one fourth. (2/5) * (1/4)= 1 tenth.

3 0
3 years ago
In the table, the relation (x, y) is not a function if the missing value of x is___.
stepladder [879]
X is 6 that is the missing value in the equation

8 0
3 years ago
Please simplify with a explanation!~
PilotLPTM [1.2K]

Answer:

-4y + 20

Step-by-step explanation:

4(-y+5)

What we need to do here is get rid of the parentheses, which can be achieved through multiplication.

This is another way of saying 4 times -y plus 4 times 5.

Let's break the the parentheses down into 2 separate formulas.

4(-y) and 4(5)

Now we can multiply these two together to get -4y and +20. When combined, we get -4y +20.

6 0
3 years ago
F(x) = 17x2 - 9x, g(x) = 12x - 9;Find (f ∘ g)(11).
Schach [20]
C. 23,487 is the correct answer
4 0
3 years ago
The line inside this circle is its
Alex777 [14]
The answer will be (D)
Hope this helps
May i plz have brainliest?
6 0
2 years ago
Other questions:
  • Consider △LNM. Triangle L M N is shown. Angle N M L is a right angle. Which statements are true for triangle LNM? Check all that
    9·2 answers
  • Graph the linear equation. Find three points that solve the equation, then plot them on the graph. EQUATION: x-4y= -18
    8·1 answer
  • Three times b less than 100 is equal to the product of 6 and b
    11·2 answers
  • 905,238 In a word form
    10·1 answer
  • CJ = 3x + 6,<br> CT = 37, and<br> JT = 3x + 7<br> Find JT.
    11·1 answer
  • Help fast!! PLEASE. Will appreciate it! Thanks! HELP!!
    7·1 answer
  • Which items are tax deductible for consumers who are buying or renting a home
    15·1 answer
  • HELP ASAP ILL GIVE BRAINLIST
    13·1 answer
  • I'll give brainlist if anyone answer correctly on these 2 questions
    14·2 answers
  • Find the slope of the line that passes through the pair of points: (2,-3) and
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!