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4 years ago

BRAINLEST FOR WHO ANSWERS IT RIGHT

Mathematics

2 answers:

Vlad1618 [11]4 years ago

8 0

Answer:

10/20

Step-by-step explanation:

im not sure just guessin so i can get brainlyest

marin [14]4 years ago

7 0

Answer:

8/20

Step-by-step explanation:

Prime numbers: 1,2,3,5,7,13,17,19

Prob. = 8/20

Brainliest?

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A case-control study identified an odds ratio of 8.56. The study examined whether asthma was related to the presence of cockroac

Anna71 [15]

Answer:

what class is this in

Step-by-step explanation:

6 0

3 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

Can u answer this please

Svetradugi [14.3K]

Answer:

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

(x - 4)² + (y - 3)² = 16 ← is in standard form → C

4 0

3 years ago

For the given functions f and g, find the indicated composition:

mihalych1998 [28]

Answer: x

<u>Step-by-step explanation:</u>

g(x) = 4x + 10 f(x) = $\frac{x - 10}{4}$

to find g(f(x)), replace "x" in the g(x) equation with what f(x) equals. Another way of writing g(f(x)) for this problem is: g( $\frac{x - 10}{4}$ ).

g(f(x)) = 4 $(\frac{x - 10}{4})$ + 10

= x - 10 + 10

= x

3 0

3 years ago

Harper has $15.00 to spend at the grocery store. she is going to buy bags of fruit that cost $4.75 each and one box of crackers

Butoxors [25]

She can buy 2 bags of fruit (adds up to 9.50) and of course the box of crackers that is 3.5, in total it adds to $13. So the answer is she can buy 2 bags of fruit.

6 0

3 years ago

BRAINLEST FOR WHO ANSWERS IT RIGHT​

BRAINLEST FOR WHO ANSWERS IT RIGHT