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3 years ago

PLS HELP ILL PICK BRAINLIEST PLSSSSSSSSSSSSSSSSSSSSSSSS

Mathematics

1 answer:

mr_godi [17]3 years ago

7 0

Answer:

Step-by-step explanation:

i am to lazy to explain so sry

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A park district has 25 elm trees and 20 oak trees to be planted. They are separating the trees for different areas. They want ea

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2 areas because there isnt an equal amount of elm trees and oak trees to be planted

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4 years ago

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Find the solution to the differential equation dz/dt = 7te^4z that passes through the origin.

andreev551 [17]

Answer:

$z=(\frac{-1}{4} )ln|1-14t^{2}|\\$

Step-by-step explanation:

from the equation, $\frac{dz}{dt}=7te^{4z}\\$ .

we can give different approach to the equation, but to make it simple and direct, let separate the equation by bringing all like terms to the same side i.e

$\frac{dz}{e^{4z}}=7tdt\\e^{-4z} dz=7tdt$ .

if we integrate both side,

$\int\limits^a_b{e^{-4z} } \,dz =\int\limits^a_b {7t} \,dt$

$-1/4e^{-4z} +c_{1}=7/2t^{2} +c_{2}\\-1/4e^{-4z}= 7/2t^{2} +c_{2}-c_{1}\\let c_{2}-c_{1}=c \\-1/4e^{-4z}= 7/2t^{2} +c$

since the equation passes through the origin, and at the origin z=0 and t=0

we substitute this values and solve for the constant c

$e^{-4*0}= 7/2*0 +c\\c=1$ .

If we substitute the value of c into the equation we arrive at

$(-1/4)e^{-4z}= (7/2)t^{2}+1\\ e^{-4z}=1-14t^{2} \\$

if we the the natural logarithm of both sides, we arrive at

$-4z=ln|1-14t^{2}|\\z=(\frac{-1}{4} )ln|1-14t^{2}|\\$

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3 years ago

How do you reduce the ratio 250:400

Mkey [24]

You can divide by 10 and with that its simplified to 25;40...

then you can divede by 5 with that simplified its 5;8

So the answer is 5:8<span />

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3 years ago

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an airplane on autopilot took 5 hours to travel 3,475 kilometers. what is the unit rate for kilometers per hour?

Musya8 [376]

To find the unit rate, divide total kilometers traveled by total hours traveled.

3475 kilometers / 5 hours = 695 kilometers per hour.

The unit rate is 695 kilometers per hour.

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3 years ago

If $ 350 is divided in the ratio 2:5,<br> then the larger portion is

Vlada [557]

Answer:

250

Step-by-step explanation:

The total of the ratios is

2+5 = 7

Take the total amount and divide by 7

350 / 7 = =50

Multiply each amount by 50

2*50 : 5 * 50

100 : 250

The larger portion is 250

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3 years ago

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