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3 years ago

Please help I only have a few minutes!!!!!

Mathematics

1 answer:

bulgar [2K]3 years ago

6 0

Answer:

25 x a real answer and you don ' t

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Read and solve quickly please

REY [17]

I believe the answer is 21

4 0

3 years ago

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Consider the system of differential equations dxdt=−4ydydt=−4x. Convert this system to a second order differential equation in y

koban [17]

$\dfrac{\mathrm dy}{\mathrm dt}=-4x\implies x=-\dfrac14\dfrac{\mathrm dy}{\mathrm dt}\implies\dfrac{\mathrm dx}{\mathrm dt}=-\dfrac14\dfrac{\mathrm d^2y}{\mathrm dt^2}$

Substituting this into the other ODE gives

$-\dfrac14\dfrac{\mathrm d^2y}{\mathrm dt^2}=-4y\implies y''-16y=0$

Since $x(t)=-\dfrac14y'(t)$ , it follows that $x(0)=-\dfrac14y'(0)=4\implies y'(0)=-16$ . The ODE in $y$ has characteristic equation

$r^2-16=0$

with roots $r=\pm4$ , admitting the characteristic solution

$y_c=C_1e^{4t}+C_2e^{-4t}$

From the initial conditions we get

$y(0)=5\implies 5=C_1+C_2$

$y'(0)=16\implies-16=4C_1-4C_2$

$\implies C_1=\dfrac12,C_2=\dfrac92$

So we have

$\boxed{y(t)=\dfrac12e^{4t}+\dfrac92e^{-4t}}$

Take the derivative and multiply it by -1/4 to get the solution for $x(t)$ :

$-\dfrac14y'(t)=\boxed{x(t)=-\dfrac12e^{4t}+\dfrac92e^{-4t}}$

7 0

3 years ago

HELP WITH MATH!!!!!!!!

Likurg_2 [28]

Answer:

28 units sqr

Step-by-step explanation:

Area of Rectangle

A= Lw = 8(4) = 32

Area of Triangle

A= $\frac{b(h)}{2}$ = $\frac{2(4)}{2}$ = 4

32- 4 = 28 units sqr

8 0

3 years ago

If a simple machine reduces the strength of a force, what must be increased?

ch4aika [34]

I think the answer is C. The distance over which the force is applied. Hope this helps!

4 0

3 years ago

HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

morpeh [17]

Answer:

kayla and 9968

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers