I need help please i will give brainliest

Answer:

[tex]C(t)=5\cdot(0.9)^t[/tex]

Step-by-step explanation:

The exponential function is often used to model natural growing or decaying processes, where the change is proportional to the actual quantity.

An exponential decaying function is expressed as:

[tex]C(t)=C_o\cdot(1-r)^t[/tex]

Where:

C(t) is the actual value of the function at time t

Co is the initial value of C at t=0

r is the decaying rate, expressed in decimal

The concentration of the pollutants starts at Co=5 mg/lt. We also know the pollutant reduces its concentration by 10% each hour. This gives us a value of r = 10% / 100 = 0.1

Substituting into the general equation:

[tex]C(t)=5\cdot(1-0.1)^t[/tex]

Operating:

[tex]\boxed{C(t)=5\cdot(0.9)^t}[/tex]

y(n) = 5(0.9)ⁿ

y(n) = a(1 - b)ⁿ

where;

y is the final amount at time n,

a is the original amount

b is the decay factor

x is the amount of time that has passed.

Thus;

a = 5 mg/L.

We are told that the pollutant reduces its concentration by 10% each hour. Thus; b= 10%

b = 0.1

y(n) = 5(1 - 0.1)ⁿ

y(n) = 5(0.9)ⁿ

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it is very easy first multiply (8*2) then our ans 16

then add 16 + 5 = 21 21\5

answer 21\5

Answer:

-2 times 8\3

Step-by-step explanation:

the answer is -48

Answer: -5 1/3

Step-by-step explanation: First, convert -2 into a fraction by putting a 1 under the -2. So, you should have -2/1. Since, you‘re multiplying a negative times a positive, you’re answer should be negative. Next, multiply -2/1 x 8/3 by cross multiplying. You should end up with an answer of -5 1/3.

Answer:

The greatest number of piñatas you can make with the gifts is:

Step-by-step explanation:

To identify the greatest number of piñatas, you must think in a number that can divide another and obtain a whole number with this:

Bigger the number, greater the number of piñatas, in this case, you can see the numbers given can be divided into four numbers obtaining a whole number: 1, 2, 3, and 6. Remember that the best number is the greatest, in this case, number six. Now you proceed to divide the numbers into 6:

Taking into account the values obtained, you can see that each piñata would have: 3 bottles of nail polish, 4 pairs of earrings, and 7 lollipops.

Answer:

She did 5.60-2.31=2.25

Step-by-step explanation:

She should have subtracted 5.6-2.31=3.29

-    Answer:

the answer is 3.29

she didn't put the decimal point in the right place when subtracting

Step-by-step explanation:

correct

5.6

-

2.31 =

3.29

NOTICE THAT IN THIS PROBLEM THE  DECIMAL POINTS ARE ALIGNED WITH EACH OTHER.

wrong

 5.6  

-

2.31

=

2.25

     NOTICE THAT IN THIS PROBLEM THE  DECIMAL POINTS ARE NOT ALIGNED WITH EACH OTHER.

Also plz mark brainliest and try to answer my question

Answer:

18x^2 - 40x / 3

Answer:

C

Step-by-step explanation:

4(3x+5) = 12x+20

Answer:

c

Step-by-step explanation:

Answer:  The box of Weetabix is heavier by 0.01 kg

Step-by-step explanation:

Divide 9/25 to get the decimal equivalent

9÷25 =0.36

Compare Shredded Wheat at 0.35 kg to Weetabix at 0.36 kg

Weight of the box of Shredded Wheat is [tex]0.35[/tex] kg and weight of the box of Weetabix is [tex]0.45[/tex] kg.

So, the box of Weetabix is heavier.

Weight of the box of Shredded Wheat [tex]= 0.35[/tex] kg.

Weight of the box of Weetabix [tex]= \frac{9}{25}[/tex] kg.

Here to compare the two weights, first make both of them similar.

Either make both of them decimals or both of them fraction.

Here, we will make both the weights decimals.

[tex]\frac{9}{20} = 0.45[/tex]

Now, [tex]0.45>0.35[/tex]

So, the box of Weetabix is heavier.

Learn more here:

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Answer:

-4 = x

Step-by-step explanation:

g(x) = -X – 1

g(x) = 3

3 = -x-1

Add 1 to each side

3+1 = -x-1+1

4 = -x

Multiply by -1

-4 = x

Answer:

it's A

Step-by-step explanation:

2x - 1

I put b and got it wrong

Answer:

x=24

Step-by-step explanation:

0.6x - 5 = 0.1x + 7

add 5 to both sides:

0.6x = 0.1x + 12

take away 0.1x from both sides:

0.5x = 12

divide both sides by 0.5

x = 12÷0.5

x=24

hope this helps

brainliest plz?

x

Monday 4hours and 30minutes were worked

do 12-8 then take the thirty minutes and add it on to the difference

because that is the time she is working

happy to help plz mark brainliest

Answer:

janelle is 2,015.75 ft above sea level the altimeter should read plus 2,015.75

2,015.75 ft is the Janelle's position relative to sea level while hiking and the altimeterread this position as 2,015.75.

hope this hep you

Answer:

They will each get 6 a piece

Answer:

probable as

1.8 × 10 = 18

brainliest ig?

Answer:

196

Step-by-step explanation:

THATSSS THE ANSWERRRRR!!

Answer:

with what?

Step-by-step explanation:

Answer:

Observational study

Step-by-step explanation:

Answer:

D: Observational Study

Step-by-step explanation:

edg2020

He did not go around asking people how many of them buy lunch, so it is not a survey. He did not create the settings and conditions or simulate possible examples, so its not B. He did not control or change any variables, so it is not an experiment. He simply walked around and Observed people to get information for his study. Thus it is D.

Answer:

2/3

Step-by-step explanation:

multipy (X+2) by 7 the you multiply (2x-4) by 6 I.e

-7×X- (-7×2)+4x=6×2x-6×4

-7x-14+4x=12x-24

collect like terms

-7x+4x-12x=-24+14

-15x=10

divide both side by -15, so that X can stand alone

-15x/-15=-10/-15

-15 cancels -15, minus cancels minus

X=10/15

X=2/3

A number line is just that – a straight, horizontal line with numbers placed at even increments along the length. The square root of 10 lies between 3 and 4.

A number line is just that – a straight, horizontal line with numbers placed at even increments along the length. It’s not a ruler, so the space between each number doesn’t matter, but the numbers included on the line determine how it’s meant to be used.

In order to find the square root of 10 lies between which two numbers the approximate value of the root is needed to be calculated.

√10 = 3.162.......

Now, if we plot √10 on the number line its value will lie between 3 and 4.

Hence, The square root of 10 lies between 3 and 4.

Learn more about the Number line:

https://brainly.com/question/557284

#SPJ2

Answer:

5km/hr

Step-by-step explanation:

Given

Distance = 3km and 2km

Time = 30 mins, 15 mins, 15 mins

Required

Determine the average speed

To answer this, we need to determine the total distance.

Distance =3km + 2km = 5km

Then, we calculate the total time

Time = 30 mins + 15 mins + 15 mins = 1 hr

Next, we can now determine the average speed using:

Average Speed = Total Distance/Total Time

Average Speed = 5km/1 hr

Average Speed = 5km/hr

Answer:

There no sufficient evidence to support the manufactures claim at the 0.05 level

Step-by-step explanation:

From the question we are told that

   The  mean is  [tex]\mu = 22100 \ miles[/tex]

    The  sample mean is [tex]\= x = 23400 \ miles[/tex]

   The  sample size is  [tex]n  = 18[/tex]

   The standard deviation is [tex]\sigma  =  1 500 miles[/tex]

    The test statistics is  [tex]t = 3.677[/tex]

    The level of significance is [tex]\alpha  =  0.05[/tex]

The null hypothesis  is  [tex]H_o :  \mu =  22100[/tex]

The  alternative hypothesis  is  [tex]H_a :  \mu  \ne 22100[/tex]

Generally the p-value  is mathematically represented as

     [tex]p-value  =  2 *  P(t >3.677 )[/tex]

From the z-table  [tex]P(t >3.677 )  =  0.000118[/tex]

So

    [tex]p-value  =  2 *  0.000118[/tex]

=> [tex]p-value  =  0.000236 [/tex]

From he value given and obtained we see that  [tex]p-value  <  \alpha[/tex]

Hence we reject the null hypothesis

Hence there no sufficient evidence to support the manufactures claim

Answer:

The correct answer is B) (7,2).

Step-by-step explanation:

I hope this helps!

Answer:

Step-by-step explanation:

Answer:

b

Step-by-step explanation:

go it right on edge

Answer:

2

Step-by-step explanation:

1+1=2

Answer:  

-1                           0                             1                          2  2 1/4 2.33  2.5  √8    3     |                           | .                             |                           |         ^    ^ .   ^        ^ .    |  

Step-by-step explanation: All the values are between 2 and 3

I hope this shows up correctly and helps.

Answer:

-2x - 28

Step-by-step explanation:

-4(x+6) +2 (x-2)    Distribute the -4 to (x+6) and the 2 to (x-2):

-4x - 24 + 2x - 4  Combine like terms  -4 + 2x and -24-4:

-2x - 28

Hope this helped :)

Answer:

Please see explanation.

Step-by-step explanation:

-4(x+6) + 2(x-2)   First, distribute the -4 to x+6

-4x - 24 + 2(x-2)   Now distribute the 2 into x-2

-4x - 24 + 2x - 4   Combine like terms

-4x + 2x - 24 - 4

-2x - 28                  This might be your answer but if you are looking for what x is equal to then keep following along.

If you are solving for x then most likely the equation says that it is equal to zero

-2x - 28 = 0   Add 28 to both sides

-2x = 28        divide both sides by -2

x = -14

Answer:

it's a dirty joke, like when you type things into a calculator and turn it upside down to make it look like a word. It's not an equation

Step-by-step explanation:

Answer:

its a depiction using symbols from a calculator about mens sexual organs its really dirty and you shouldn't use it especially if you are too inoccent to know what it is