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Vitek1552 [10]
2 years ago
7

Biologists have proposed a cubic polynomial to model the length l of alaskan rockfish at age a:l = 0.0155a3 − 0.372a2 + 3.95a +

1.21, where l is measured in inches and a is in years. (a) (2 pts) calculate dl da a=12 (b) (2 pts) interpret your answer.
Mathematics
1 answer:
Kryger [21]2 years ago
3 0
(a) To answer this item, we are to differentiate the given equation, l, in terms of a. This is as shown below.

            dl/da = 3(0.0155)a² - 2(0.372)a + 3.95

Substituting the known value, a = 12
          dl/da = (3)(0.0155)(12)² - 2(0.372)(12) + 3.95

Simplify,
       dl/da = 1.718

(b) The answer in a tells us that the length of the alaskan rockfish will change at a rate of 1.718 inches/year when it is already 12 years old. 
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Answer:

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4 0
2 years ago
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galben [10]
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(g+f)(2)=>

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(g-f)(-1)

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8 0
2 years ago
Of the bundles delivered daily to the store, 1/3
Triss [41]

Answer:

x=9

Step-by-step explanation:

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Morning edition of the daily sun=1/3x

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3x-2x/3=3

x/3=3

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x=3×3

x = 9

3 0
2 years ago
The graph shows two straight lines. The equation of line A is y = 2 - x Work out the equation of line B.
d1i1m1o1n [39]

Answer:

Step-by-step explanation:

The equation of a line can be easily found from the graph.  First, find two points on the line that intersect points on the graph, then plot the changes in the two axis in this manner (change in y)/(change in x), or rise/run.  Thus, the slope of this line is 5/3.  Then, the  b in y = mx + b is simply when the line intersects the y-axis, in this case -5.  Thus, the equation of the line is

y = -5/3x - 5

Hope it helps <3

(If it does please mark brainliest ._. :) )

5 0
2 years ago
Bill wants to rent a car. Rental company A charges $35 per day plus $0.10 per mile driven. Rental company B charges $25 per day
Llana [10]
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7 0
2 years ago
Read 2 more answers
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