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IgorLugansk [536]
3 years ago
15

What is the value of the expression?

Mathematics
1 answer:
KengaRu [80]3 years ago
8 0

Answer:

<h2>B. -3.2</h2>

Step-by-step explanation:

4\!\!\!\!\diagup^1\cdot\dfrac{-6.4}{8\!\!\!\!\diagup_2}=-\dfrac{6.4}{2}=-3.2

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The number of a particular fish in thousands x years after 1972 can be modeled by f(x)=230(0.886)x. Estimate the year when the n
sashaice [31]

Answer:

The year is 1979.

Step-by-step explanation:

Given:

The function relating fish population and number of years since 1972 is:

f(x)=230(0.886)^x\\Where,\ f(x)\rightarrow \textrm{fish population}\\x\rightarrow \textrm{number of years passed after 1972}

Now, when the fish population reaches 99 thousand, it means that f(x)=99. Now, plugging in f(x)=99 in the above equation and solving for x. This gives,

99=230(0.886)^x\\\frac{99}{230}=0.886^x\\\\\textrm{Taking natural log on both sides}\\\ln(0.886)^x=\ln(\frac{99}{230})\\\\\textrm{Using log property: }\log a^b=b\log a\\x\ln (0.886)=\ln(0.43)\\x\times (-0.12)=-0.84\\x=\frac{-0.84}{-0.12}=7\ years

Therefore, the year after 7 years passed since 1972 is given as:

1972 + 7 = 1979.

So, the year when the number of fish reaches 99 thousand is 1979.

8 0
3 years ago
Please answer this correctly <br> Is the answer <br> 2:04am<br> 6:14pm<br> 4:04am<br> 7:14pm
Bezzdna [24]

Answer:

I think it is 2:04am

Step-by-step explanation:

7:39+4.25 around 11ish

and since mt and ny are different tine zones that are 2 hrs away. It is 2:04 am.

7 0
3 years ago
Read 2 more answers
Solve for x.<br> -1/2(x + 5) = -10<br> A) -25 <br> B) -10 <br> C) 0 <br> D) 15
san4es73 [151]

D 15

-1/2(x+5)=-10

-1(x+5)=-10×2

-x-5=-20

-x=-20+5

-x=-15

x=15

5 0
2 years ago
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Explain this please? I don't understand it
Andrej [43]
Step 1 reason is GIVEN
8 0
3 years ago
Hi, please help me<br><br>c - 4d =<br><br>C= 10<br>D=2<br><br>It's algebra​
Inessa [10]

Answer:

All you do is replace the variable with the numbers given to replace them.

So your new equation is 10-4(2) this was given to you C=10 , D=2

Okay, let's solve it 10-4(2)

4*2 equals 8 so now it's 10-8

10-8

<h2>=<em> 2</em></h2>

7 0
3 years ago
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