3 years ago

Find the value of x. 128 (6x + 20

Mathematics

1 answer:

DENIUS [597]3 years ago

6 0

What is the 128 for ?

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Rewrite in simplest terms (-9x-2y)+(4x-5y)

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Step-by-step explanation:

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A biologist is studying the growth of a particular species of algae. She writes the following equation to show the radius of the

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Answer:

The reasonable domain to plot the growth function is the interval [0,9]

$0\ days\leq d\leq 9\ days$

Step-by-step explanation:

In this problem we have a exponential function of the form

$f(d)=a(b^d)$

where

f(d) is the radius of the algae in mm

d is the number of days

a is the initial value or y-intercept

b is the base

r is the rate of growth

b=1+r

we have

$a=9\ mm\\b=1.04\\r=1.04-1=0.04=4\%$

we have

$f(d)=9(1.04^d)$

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substitute in the function and solve for d

$12.81=9(1.04^d)$

$(12.81/9)=(1.04^d)$

Apply log both sides

$log(12.81/9)=log(1.04^d)$

$log(12.81/9)=(d)log(1.04)$

$d=log(12.81/9)/log(1.04)$

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therefore

The reasonable domain to plot the growth function is the interval [0,9]

$0\ days\leq d\leq 9\ days$

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Step-by-step explanation:

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