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
professor190 [17]
3 years ago
10

True or false: 3x^2+5x^3=8x^3

Mathematics
1 answer:
MrRa [10]3 years ago
7 0

Answer:

false

Step-by-step explanation:

You might be interested in
What is 1+1 plz help
Dominik [7]

Answer:

2

Step-by-step explanation:

1+1=2

3 0
2 years ago
A 1000-liter (L) tank contains 500 L of water with a salt concentration of 10 g/L. Water with a salt concentration of 50 g/L flo
djverab [1.8K]

Answer:

a) y(t)=50000-49990e^{\frac{-2t}{25}}

b) 31690.7 g/L

Step-by-step explanation:

By definition, we have that the change rate of salt in the tank is \frac{dy}{dt}=R_{i}-R_{o}, where R_{i} is the rate of salt entering and R_{o} is the rate of salt going outside.

Then we have, R_{i}=80\frac{L}{min}*50\frac{g}{L}=4000\frac{g}{min}, and

R_{o}=40\frac{L}{min}*\frac{y}{500} \frac{g}{L}=\frac{2y}{25}\frac{g}{min}

So we obtain.  \frac{dy}{dt}=4000-\frac{2y}{25}, then

\frac{dy}{dt}+\frac{2y}{25}=4000, and using the integrating factor e^{\int {\frac{2}{25}} \, dt=e^{\frac{2t}{25}, therefore  (\frac{dy }{dt}+\frac{2y}{25}}=4000)e^{\frac{2t}{25}, we get   \frac{d}{dt}(y*e^{\frac{2t}{25}})= 4000 e^{\frac{2t}{25}, after integrating both sides y*e^{\frac{2t}{25}}= 50000 e^{\frac{2t}{25}}+C, therefore y(t)= 50000 +Ce^{\frac{-2t}{25}}, to find C we know that the tank initially contains a salt concentration of 10 g/L, that means the initial conditions y(0)=10, so 10= 50000+Ce^{\frac{-0*2}{25}}

10=50000+C\\C=10-50000=-49990

Finally we can write an expression for the amount of salt in the tank at any time t, it is y(t)=50000-49990e^{\frac{-2t}{25}}

b) The tank will overflow due Rin>Rout, at a rate of 80 L/min-40L/min=40L/min, due we have 500 L to overflow \frac{500L}{40L/min} =\frac{25}{2} min=t, so we can evualuate the expression of a) y(25/2)=50000-49990e^{\frac{-2}{25}\frac{25}{2}}=50000-49990e^{-1}=31690.7, is the salt concentration when the tank overflows

4 0
3 years ago
is x-1 taking away an x or adding an x?? im trying to find the perimeter of area tiles, and the perimeter is x + x + x + (x-1) +
Vanyuwa [196]

Answer:

4x + 2

Step-by-step explanation:

x - 1 is adding an x and subtracting a 1 ,so

x + x + x + (x - 1) + 1 + 1 + 1

= x + x + x + x - 1 + 1 + 1 + 1 ← collect like terms

= 4x + 2

3 0
2 years ago
Which of the following is a polynomial?
Artyom0805 [142]

Answer:

C

Step-by-step explanation:

8 0
3 years ago
What is the value of y?<br><br> Enter your answer, as an exact value, in the box.
mylen [45]

Answer:

y/2 = tan(60) => y = 2 tan(60) = 2sqrt(3) = 3.464

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • A=4, b=2,c=-1 find value of a-b+c
    8·2 answers
  • Nicole has 122 books to put on shelves. she decides to put 15 books on a shelf as often as she can. how many shelves does she ne
    8·1 answer
  • Easy Buy Company gave out 7 DVD's to each of their employees as gifts. There were
    6·2 answers
  • Suppose you invest $5000 at an annual interest rate of 6.3% compounded continuously. How much will you have in the account after
    10·2 answers
  • What does the solution to this system mean in context of this problem ?
    14·1 answer
  • Solve the equation 3x^2<br> 10x + 5 = 0 to the nearest tenth.
    11·1 answer
  • What expression is the factorization of x^2+10x+21
    12·2 answers
  • Imaginary numbers : negative 48 squared
    9·1 answer
  • 1. The distance of a doorknob from the floor is about 1 what?
    13·2 answers
  • PLEASE HELP WITH THIS ONE QUESTION
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!