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Kipish [7]
2 years ago
7

8 1/5 - 3 4/5 help me PLEEEEEASE

Mathematics
2 answers:
Furkat [3]2 years ago
7 0
The answer will be 4 2/5 !
Alex17521 [72]2 years ago
3 0

Answer:

1/5x(41-19h)

41/5-19/5h

Step-by-step explanation:

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The Pacific halibut fishery has been modeled by the differential equation dy dt = ky 1 − y K where y(t) is the biomass (the tota
Dafna1 [17]

Answer:

a. The biomass weighs 2.30 * 10^7 kg after a year

b. It'll take 2.56 years to get to 4*10^7kg

Step-by-step explanation:

a.

k = 0.78,K = 6E7 kg

Given

dy/dt = ky(1- y/K)

Make ky dt the subject of formula

ky dt = dy/(1-y/K) --- make k dt the subject of formula

k dt = dy/(y(1-y/K))

k dt = K dy / y(K-y)

k dt = ((1/y) + (1/(K-y)))dy ---- integrate both sides

kt + c = ln(y/(K-y))

Ce^(kt) = y/(K-y)

Substitute the values of k and K

Ce^(0.78t) = y/(6*10^7 - y) ----- (1)

Given that y(0) = 2 * 10^7kg

(1) becomes

Ce^(0.78*0) = (2 * 10^7)/(6*10^7 - 2*10^7)

Ce° = (2*10^7)/(4*10^7

C = 2/7

Substitute 2/7 for C in (1)

2/7e^0.78t = y/(6*10^7 - y) ---(2)

We're to find the biomass a year later

So, t = 1

2/7e^0.78 = y/(6*10^7 - y)

0.62 = y/(6*10^7 - y)

y = 0.62(6*10^7 - y)

y = 0.62*6*10^7 - 0.62y

y + 0.62y = 0.62*6*10^7

1.62y = 0.62*6*10^7

1.62y = 3.72 * 10^7

y = 2.30 * 10^7kg.

Hence, the biomass weighs 2.30 * 10^7 kg after a year

b.

Here, we're to calculate the time it'll take the biomass to get to 4*10^7 kg

Substitute 4*10^7 for y in (2)

2/7e^0.78t = 4*10^7/(6*10^7 - 4*10^7)

2/7e^0.78t = 4*10^7/2*10^7

2/7e^0.78t = 2

e^0.78t = (2*7)/2

e^0.78t = 2

t = 2 * 1/0.78

t = 2.56 years

Hence, it'll take 2.56 years to get to 4*10^7kg

8 0
3 years ago
Math help please & explain how to dobit
Dmitrij [34]
1 1/3 you have to divide 4÷3 and u get 1 as a whole number then you get the remainder and put it as a fraction
6 0
2 years ago
5a + 7 - 8b - 3a +2b - 4
kifflom [539]

━━━━━━━☆☆━━━━━━━

▹ Answer

<em>2a + 3 - 6b</em>

<em />

▹ Step-by-Step Explanation

5a + 7 - 8b - 3a + 2b - 4

<u>Collect like terms</u>

2a + 7 - 8b + 2b - 4

<u>Final Answer</u>

2a + 3 - 6b

Hope this helps!

- CloutAnswers ❁

Brainliest is greatly appreciated!

━━━━━━━☆☆━━━━━━━

3 0
3 years ago
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Camille is working in craft class to create new pillows for her room. Each pillow will be made from exactly 36 in2 of material.
Ann [662]

The best design for Camille is the one in which the area matches the total of material she wants to use for each pillow.

<h3>What should Camille consider for her design?</h3>

Camille's main restriction is the material per pillow since she needs every pillow to use only 36 inches of material. Due to this, she needs to make sure the design meets this requirement.

<h3>How to determine how much material each design requires?</h3>

The best method for this is to calculate the area of the design by using the sides. Here are the most common formulas:

  • Triangular design: Base x height/ 2
  • Squared or rectangular design: side x side
  • Circular design: A = π r²

Based on this, the best design is the one that adjusts to the material available.

Note: This question is incomplete because there is no information about the designs; due to this, I answered it based on general knowledge.

Learn more about area in: brainly.com/question/16151549

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2 years ago
Which exponential function grows at a faster rate than the quadratic function for zero is less than X is less than three
olga_2 [115]

Answer:D

Step-by-step explanation:

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3 years ago
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