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lukranit [14]
3 years ago
8

1) Solve using the inverse operation. X/8 = 10

Mathematics
1 answer:
NeTakaya3 years ago
4 0

Answer:

x=18

Step-by-step explanation:

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A marine biologist monitors the population of sunfish in a small lake. He records 800 sunfish in his first year, 600 sunfish in
Colt1911 [192]

Answer:

Let's use the variable y to represent the number of years passed since the first year.

The population on the first year (y = 0) was 800

The population in the second year (y = 1) was 600.

The ratio in which the population decreased can be calculated as:

R = 600/800 = 0.75

This means that 600 is the 75% of 800, this also means that between the first year and the second year, the population decreased by the 25%

Now let's look at the ratio between the second and third year (y = 2), the population the third year was 450

Now the ratio is:

R = 450/600 = 0.75

Same as before, then we already can see that the population will decrease by 25% each year.

The generic exponential decay equation is:

f(y) = A*(1  - r)^y

where:

A = initial population, in this case, is 800

y = our variable, in this case, represents the number of years

r = the amount that decreases per each unit of our variable, this must be written in decimal form. In this case, we know that the population decreases by 25% each year, and 25% written in decimal form is 0.25

Also, (1 - r) = R, where R is the ratio we found earlier.

To do this, we just divide 25% by 100% to get (25%/100% = 0.25)

Then our equation will be:

f(y) = 800*(1 - 0.25)^y

f(y) = 800*( 0.75)^y

1) We want to predict when the population will be 200.

to do this, we set:

f(y) = 200 = 800*( 0.75)^y

and solve it for y.

(200/800) = 0.75^y

(1/4) = 0.75^y

Now we can use the relationship:

Ln(a^x) = x*ln(a)

Then let's apply Ln( ) in both sides to get

ln(1/4) = y*ln(0.75)

ln(1/4)/ln(0.75) = y = 4.8 years.

This means that 4.8 years after the first year, the population will be around 200.

2) The population in the 25 th year (this is 24 years after the first one, so we take y = 24) is:

f(24) = 800*(0.75)^(24) = 0.80

Around this point, we will have no more sunfish in the lake.

7 0
3 years ago
Hey please help i’ll give brain
Kobotan [32]

Answer:

The missing numbers are 5, then 35, then 49.

Step-by-step explanation:

I promise it's right :)

3 0
3 years ago
Read 2 more answers
Let g(x) be the reflection across the y-axis of the function f(x) = 5x + 8. Identify the rule for g(x).
Allushta [10]

Answer:

Option B:  g(x) = −5x + 8

Step-by-step explanation:

If we have a function f(x) and wish to make a function g (x) that is equal to the reflection of the function f(x) on the y-axis, then we must make the following transformation to f(x):

g(x) = f(-x)

In this case:

f(x) = 5x +8.

So when applying the transformation we obtain:

g(x) = f(-x) = 5(-x) + 8

Finally we have that

g(x) = -5x +8

7 0
3 years ago
Read 2 more answers
3x + 7 = -x-1<br>4x=-8<br>x=-2​
poizon [28]

Answer:

3x + 7 = -x -1

1=1

4x = -8

-8 = -8

Step-by-step explanation:

3x + 7 = -x -1

3(-2)+7=-(-2)-1

-6+7=2-1

1=1

4x = -8

4(-2)=-8

-8 = -8

8 0
2 years ago
(3+(12÷6-5))-5<br>order of operations
abruzzese [7]

If your asking for the solution the you solve what in the parentheses . Since (12/6-5) is in the parentheses you solve that first. 12/6 is 2. 2-5= -3.

3+-3=0. All that’s left is -5. The answer is -5 .-.

7 0
2 years ago
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