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
vesna_86 [32]
3 years ago
12

Two pipes running together can fill a tank in 20 minutes.

Mathematics
1 answer:
Hunter-Best [27]3 years ago
3 0

Answer:

45, 36

Step-by-step explanation:

let x y minutes be the time for pipes to fill the tank, let n be the water needed to fill the tank.

x-y=9

(n/x)*20+(n/y)*20=n

n is removed by dividing the 2nd equation by n

here u get:

(1/x+1/y)*20=1

you sub x=9+y into the above equation

1/y+1/(9+y)=1/20

((9+y)+(y))*20=(9+y)(y)

180+40y=9y+y2

y2-31y-180=0

then use the quadratic formula and u will find y=36 or -5

-5 is rejected because it is negative

x=36+9=45

therefore it is 36 mins and 45 mins

You might be interested in
Please help I need to finish my homework
valina [46]

Answer:

AB= 0.625 units (3 s.f.)

∠BAC= 52.9° (1 d.p.)

∠ABC= 32.1° (1 d.p.)

Step-by-step explanation:

Please see the attached pictures for full solution.

- Find AB using cosine rule

- find ∠BAC using sine rule

- find ∠ABC using angle sum of triangle property

4 0
3 years ago
Whats 7, −6, 4, −10, 3 least to greatest
exis [7]

Answer:

-10, -6, 3, 4, 7

Step-by-step explanation:

Hope it helps ^^

4 0
3 years ago
Find the center and radius of the circle (x+3)^2+(y-1)^2=81
sasho [114]

The equation of a circle is written as ( x-h)^2 + (y-k)^2 = r^2

h and k is the center point of the circle and r is the radius.

In the given equation (x+3)^2 + (y-1)^2 = 81

h = -3

k = 1

r^2 = 81

Take the square root of both sides:

r = 9

The center is (-3,1) and the radius is 9

5 0
3 years ago
I need some help on this, please.
Free_Kalibri [48]

Hey there!

Area= length*width.

6.2 is the length and 3.7 is the width

3.7 *6.2= 22.94 yd^2

I hope this helps!

~kaikers


7 0
3 years ago
On an English exam, a student can make one of four grades. 40 students who took the exam were randomly selected and surveyed abo
andrezito [222]

Answer:fffffff

Step-by-step explanation:fffffffff

3 0
2 years ago
Other questions:
  • What is the interquartile range of this data set -5,-4,-3,-2,-1,0,1,2,3,4,5,7,7,7
    9·1 answer
  • Camila and her children went into a grocery store and where they sell apples for $0.50 each and mangos for $0.75 each. Camila ha
    13·1 answer
  • Which is likely to have a mass close to 700 grams?
    7·1 answer
  • What is 3.47 divided by 8
    12·2 answers
  • A wise man once said, "200 reduced by<br> twice my age is 60." What is his age?
    15·2 answers
  • A 17.5 gallon tank is 1/3 full. How many more gallons of water does it take to fill the tank?
    12·2 answers
  • Five friends share 3 pizzas equally.How much pizza does each friend get?
    15·1 answer
  • The graph of a function never has two different points with rhe same x-coordinate because
    10·1 answer
  • Are the figures below similar? Explain.
    15·1 answer
  • Please help me it’s trig!!!!!!!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!