All categories

3 years ago

Round 2,406,251 to the nearest thousand

2 answers:

5 0

The answer is 2,406,000
remember the rules for rounding, if is 5 and above your round up, if it is less than 5, round down

muminat3 years ago

4 0

I think it is 2,406,000

You might be interested in

The sum of John and Sally’s ages is 24. John is 6 years older than Sally. Which system of equations below represents this relati

tankabanditka [31]

J+S=24 and J=S+6 represents the relationship between ages.

John is 15 years old and Sally is 9 years old.

Step-by-step explanation:

Let,

John's age = J

Sally's age = S

According to given statement, the sum of their ages is 24;

$J+S=24$ Eqn 1

John is 6 years older than Sally means we will add 6 in Sally's age;

$J=S+6$ Eqn 2

Putting value of J from Eqn 2 in Eqn 1;

$(S+6)+S=24\\S+6+S=24\\2S=24-6\\2S=18$

Dividing both sides by 2

$\frac{2S}{2}=\frac{18}{2}\\S=9$

Putting S=9 in Eqn 2

$J=9+6\\J=15$

J+S=24 and J=S+6 represents the relationship between ages.

John is 15 years old and Sally is 9 years old.

Keywords: linear equation, substitution method

Learn more about substitution method at:

#LearnwithBrainly

4 0

4 years ago

A chemical substance has a decay rate of 6.9% per day. The rate of change of an amount N of the chemical is given by the equatio

GaryK [48]

Answer:

a) $N=N_0e^{-0.069t}$

b) $N=696.9$ grams

c) $t=10$ days

Step-by-step explanation:

We are going to use separation of variables to solve.

Get all your t's to one side and your N's to opposing side.

$\frac{dN}{dt}=-0.069N$

Multiply both sides by $dt$ :

$dN=-0.069N dt$

Divided both sides by $N$ :

$\frac{dN}{N}=-0.069 dt$

Integrate both sides:

$\ln|N|=-0.069t+C$

The equivalent exponential form is:

$e^{-0.069t+C}=N$

Using law of exponents you can write this as:

$e^{-0.069t}e^C=N$

$e^C$ is just a positive constant that I'm going to replace with K:

$e^{-0.069t}K=N$

Applying the symmetric property of equality:

$N=e^{-0.069t}K$

Applying the commutative property of multiplication:

$N=Ke^{-0.069t}$

K actually represents the initial amount of chemical substance since when plugging in 0 for t you get K for N, like so:

$N=Ke^{-0.069 \cdot 0}$

$N=Ke^{0}$

$N=K(1)$

$N=K$

We are given at time 0 the amount of chemical substance,N, is K. They want us to represent this value with $N_0$ instead. So the exponential equation is:

$N=N_0e^{-0.069t}$

We are given $N_0=800$ at $t=0$ .

We are asked to find how much of the chemical substance, N, remains after 2 days. So we replace t with 2 in $N=800e^{-0.069t}$ :

$N=800e^{-0.069 \cdot 2}$

Put into calculator:

$N=696.9$ (this was rounded to the nearest tenths)

The last part is asking for how many days will it take a initial 800 grams to go down to half of 800 grams.

We need to see the following equation:

$\frac{1}{2}(800)=800e^{-0.069t}$

$400=800e^{-0.069t}$

Divide both sides by 800:

$\frac{400}{800}=e^{-0.069t}$

Reduce the fraction:

$\frac{1}{2}=e^{-0.069t}$

Convert to logarithmic form:

$\ln(\frac{1}{2})=-0.069t$

Divide both sides by -0.069:

$\frac{\ln(\frac{1}{2})}{-0.069}=t$

Input into calculator:

$10.0=t$

$t=10.0$

$t=10$

6 0

3 years ago

Please help, will give brainliest to first correct answer

hichkok12 [17]

The answer is G (or the second one)

7 0

3 years ago

I need help with this please hurry it's timed

rodikova [14]

Answer:

I think B 82.3%

Step-by-step explanation:

4 0

2 years ago

Which of the following statements is true? A. Vertical angles are always complementary. B. Vertical angles are always supplement

denpristay [2]

Vertical angles always equal in measure

5 0

4 years ago

Read 2 more answers