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Vedmedyk [2.9K]
3 years ago
11

Which phrase describes the variable expression z+ 8?

Mathematics
1 answer:
grigory [225]3 years ago
8 0

Answer:

D

Step-by-step explanation:

In math increased means that you are adding.

Have a good day and a good rest of your week!

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A given field mouse population satisfies the differential equation dp/dt=.4p-450 where p is the number of mice and t is the time
Flura [38]

Answer:

a) 7.78 months

b) 1116

Step-by-step explanation:

Given -

\frac{dP}{dt} = 0.4p-450

Integrating the above equation with respect to time, we get -

\int\ \frac{dP}{0.4p-450} = \int\ dt\\

let us define new variable x

x = 0.4p - 450 \\dx = 0.4 dy

substituting these values in above integral equation, we get -

\frac{1}{0.4} \int\ \frac{dx}{x} = \int\ dt\\ln x = 0.4 t + C\\x = ce^{0.4t}

P (t) = \frac{C}{0.4} e^{0.4t}  +1125\\

at t = 0, P (0) = 1075, using this condition, we get -

\frac{c}{0.4} = -50\\P(t) = 50 e^{0.4t} +1125 \\t = 7.78\\P(0) = 1125 - \frac{1125}{e^{4.8}} = 1116

7 0
3 years ago
Klaus was replacing the roof on his house. He used 420 nails to attach all the pieces of wood. Each piece of wood needed 7 nails
Sladkaya [172]

Answer:


20


Step-by-step explanation:


if 7 nails are required for each piece of wood, you must determine how much wood you have in total by dividing the amount of nails by 7.


If you have used 40 nails out of sixty, you 20 left because


60-40=20

4 0
3 years ago
Y and x have a proportional relationship, and y = 15 when x = 3. What is the value of x when y = 4?
allsm [11]
Y = kx
k = y/x = 15/3 = 5
<span>when y = 4
5 = 4/x
x = 4/5

answer
</span><span>when y = 4 , x = 4/5</span>
8 0
3 years ago
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Answer:0.212765957

Step-by-step explanation:

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Answer:

x=y/6.28

Step-by-step explanation:

4 0
3 years ago
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