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
Marizza181 [45]
3 years ago
5

HURRY PLEASEEEEE!!!

Mathematics
1 answer:
Sever21 [200]3 years ago
4 0

Answer:

5.5 or 5 or 6

Step-by-step explanation:

anne=5+7=12(blankets per day)

bella=2+8=10 (blankets per day)

We need to use the 12 times table and 10 times table and see when they meet up

12, 24, 36, 48, 60

10, 20, 30, 40, 50, 60

it will take 5.5 days or 5 or 6

You might be interested in
(4x+3y^2)dx+2xy*dy=0 by using integrating fector
Nataly_w [17]
\underbrace{(4x+3y^2)}_M\,\mathrm dx+\underbrace{2xy}_N\,\mathrm dy=0

The ODE is exact if \dfrac{\partial M}{\partial y}=\dfrac{\partial N}{\partial x}.

M_y=6y
N_x=2y

This is not the case, so look for an integrating factor \mu(x) such that

\dfrac\partial{\partial y}\mu M=\dfrac\partial{\partial x}\mu N

Since \mu is a function of x only, you have

\mu M_y=\mu'N+\mu N_x\implies\dfrac{\mu'}\mu=\dfrac{M_y-N_x}N\implies\mu=\exp\left(\displaystyle\int\frac{M_y-N_x}N\,\mathrm dx\right)

So, the integrating factor is

\mu=\exp\left(\displaystyle\int\frac{6y-2y}{2xy}\,\mathrm dx\right)=\exp\left(2\int\frac{\mathrm dx}x\right)=x^2

Now the ODE can be modified as

\underbrace{(4x^3+3x^2y^2)}_{M^*}\,\mathrm dx+\underbrace{2x^3y}_{N^*}\,\mathrm dy=0

Check for exactness:

{M^*}_y=6x^2y
{N^*}_x=6x^2y

so the modified ODE is indeed exact.

Now, you're looking for a solution of the form \Psi(x,y)=C, since differentiating via the chain rule yields

\dfrac{\mathrm d}{\mathrm dx}\Psi(x,y)=\Psi_x+\Psi_y\dfrac{\mathrm dy}{\mathrm dx}=0

Matching up components, you would have

\Psi_x=M^*=4x^3+3x^2y^2
\displaystyle\int\Psi_x\,\mathrm dx=\int(4x^3+3x^2y^2)\,\mathrm dx
\Psi=x^4+x^3y^2+f(y)

Differentiate this with respect to y to get

\Psi_y=2x^3y+f'(y)=2x^3y=N^*
f'(y)=0\implies f(y)=C_1

So the solution here is

\Psi(x,y)=x^4+x^3y^2+C_1=C\implies x^4+x^3y^2=C

Just for a final check, take the derivative to get back the original ODE:

\dfrac{\mathrm d}{\mathrm dx}[x^4+x^3y^2]=\dfrac{\mathrm d}{\mathrm dx}C
4x^3+3x^2y^2+2x^3y\dfrac{\mathrm dy}{\mathrm dx}=0
4x+3y^2+2xy\dfrac{\mathrm dy}{\mathrm dx}=0
(4x+3y^2)\,\mathrm dx+2xy\,\mathrm dy=0

so the solution is correct.
7 0
4 years ago
What is the solution of the system of equations
White raven [17]

Answer:

It the 3rd one it's correct cuz i worked it out

Can i have a brainliest please!!:)

Step-by-step explanation:

solve your system by substitution.

c+3d=8;c=4d−6

Rewrite equations:

c=4d−6;c+3d=8

Step: Solve c=4d−6for c:

c=4d−6

Step: Substitute4d−6forcinc+3d=8:

c+3d=8

4d−6+3d=8

7d−6=8(Simplify both sides of the equation)

7d−6+6=8+6(Add 6 to both sides)

7d=14

7d

7

=

14

7

(Divide both sides by 7)

d=2

Step: Substitute2fordinc=4d−6:

c=4d−6

c=(4)(2)−6

c=2(Simplify both sides of the equation)

Answer:

c=2 and d=2

 

6 0
3 years ago
PLEASE GIVE ME AN ANSWER QUICKLY! Hiroshi spends 30 minutes on history homework , 60 minutes on English homework, and x minutes
natka813 [3]

Answer:

A

Step-by-step explanation:

  • He spends:
  • 30 mins on History
  • 60 mins on English
  • x mins on math
  • so the total time he spends is (TotalTime)minutes=(30+60+x)minutes
  • one fourth of this is his math time, since x is math time, then we have \frac{1}{4}(TotalTime)minutes=(x)minutes
  • But we know what totaltime in minutes is so \frac{1}{4}(30+60+x)minutes=(x)minutes
  • or simply: \frac{1}{4}(30+60+x)=x
8 0
3 years ago
Can anyone solve these two questions for me please? Thank you, may god bless you!
agasfer [191]

Answer:

1) 100 - 2(35) - 2.50 = x

x= $27.50

2) x * 7 + 345 = 1,740.00

x= (1,740 - 345) / 7

x= $199.29

3 0
3 years ago
One card is randomly selected from a deck of cards find the odds against drawing a seven
Stella [2.4K]

Answer:

\frac{3}{4}

Step-by-step explanation:

Probability of getting a 7 + Probability of not getting a 7 = 1.

Odds against drawing a 7 = Probability of not getting a 7.

We could calculate the probability of getting a 7 and subtract 1 from it to get the answer.

There a four sevens in a deck of card, one of each kind.

Probability of getting a 7 = $ P(7) = \frac{4}{52} = \frac{1}{13} $

$ \implies P(not \hspace{1mm} getting \hspace{1mm} a \hspace{1mm} 7) = 1 - P(7) $

$ \implies $ P(not getting a 7) $ = 1 - \frac{1}{13} = \frac{12}{13} $

4 0
4 years ago
Other questions:
  • What is the area of this face?<br>4<br>in.<br>4<br>in.<br>in<br>4<br>in.​
    9·1 answer
  • Solve the equation below for x
    5·1 answer
  • What is the area of this figure?<br> 5 yd/<br> 5 yd<br> 5 yd<br> 5 yd
    11·1 answer
  • Which values of x are solutions to the inequality?
    9·1 answer
  • Please help!! Time sensitive!!!!
    11·1 answer
  • One winter week a ski town got 15 1/2 inches of snow. On Monday the town got 2 3/4; on Tuesday it got 1 1/2 times as much; and o
    9·1 answer
  • The population, P, of six towns with time t in years are given by the following exponential equations:
    14·1 answer
  • mark buys a used car for $12,000. the value of the car depreciates 10% per year from the last time he bought the car. how much i
    11·1 answer
  • According to her running log, Ariana averaged 4 miles per week last month and 75% less this month. How much did she average this
    15·1 answer
  • What is 17/100 + 6/10 = ?<br> thx if you helped
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!