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3 years ago

PLS NEED DONE ASAP 10 MINUTES TILL DUE

Mathematics

1 answer:

jarptica [38.1K]3 years ago

5 0

Well if 4 blue circles + 1 red triangle = 2 green squares + 1 red triangle, then 2 blue circles = 1 green square

Then 3 red + 2 blue = 1 green + 2 blue, so 3 red = 1 green

If we know these facts then

3 red = 2 blue = 1 green

So the bottom one is 6 reds = 2 greens, or 1 green + 2 blue.

This makes my head hurt. They’re making it harder than it is.

Hope I didn’t confuse you more.

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Hurry plz! Will vote Brainly or whatever and will reward all point I can.

Naily [24]

Answer: 0.27

You can mark me brainliest on the other question you know

Step-by-step explanation:

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4 years ago

What type of function do you think models the amount of medicine in a person’s bloodstream after a certain amount of time?

leva [86]

Answer:

The exponential decay function.

Step-by-step explanation:

The exponential decay function can be used to model the amount of medicine in a person's bloodstream after a certain amount of time. When a drug is administered to a persons bloodstream perhaps through intravenous injections, the exponential decay function measures the initial concentration of the drug and then after a time t, it notes the new concentration. To obtain the result, the equation below is used:

C(t)=C(0)e^(-kt)

where,

k= constant

C(0)= Initial concentration after the injection

C(t)= Concentration after time t

5 0

3 years ago

If a substance decays at a rate of 25% every 10 years, how long will it take 512 grams of the substance to decay to 121.5 grams

Juliette [100K]

Answer:

It will take 50 years to decay from 512 grams to 121.5 grams.

Step-by-step explanation:

The decay formula :

$N=N_0e^{-\lambda t}$

where

N= amount of substance after t time

N₀= initial of substance

t= time.

A substance decays at a rate 25% every 10 years.

So, remaining amount of the substance is = (100%-25%)= 75%

$\frac{N}{N_0}=\frac{75\%}{100\%}=\frac{75}{100}=\frac34$ , t= 10

$N=N_0e^{-\lambda t}$

$\Rightarrow \frac {N}{N_0}=e^{-\lambda t}$

$\Rightarrow \frac34 =e^{-\lambda .10}$

Taking ln both sides

$\Rightarrow ln|\frac34| =ln|e^{-\lambda .10}|$

$\Rightarrow ln|\frac34|=-10\lambda$

$\Rightarrow \lambda=\frac{ ln|\frac34|}{-10}$

Now , N₀= 512 grams, N= 121.5 grams, t=?

$N=N_0e^{-\lambda t}$

$\therefore 121.5=512e^{-\frac{ln|\frac34|}{-10}.t}$

$\Rightarrow 121.5=512e^{\frac{ln|\frac34|}{10}.t}$

$\Rightarrow \frac{121.5}{512}=e^{\frac{ln|\frac34|}{10}.t}$

Taking ln both sides

$\Rightarrow ln|\frac{121.5}{512}|=ln|e^{\frac{ln|\frac34|}{10}.t}|$

$\Rightarrow ln|\frac{121.5}{512}|={\frac{ln|\frac34|}{10}.t}$

$\Rightarrow t=\frac{ln|\frac{121.5}{512}|}{\frac{ln|\frac34|}{10}}$

$\Rightarrow t=\frac{10.ln|\frac{121.5}{512}|}{{ln|\frac34|}}$

⇒t=50 years

It will take 50 years to decay from 512 grams to 121.5 grams.

8 0

4 years ago

2x2x-2x2 what do u get when u add them together and multiply

worty [1.4K]

Answer:

4x - 4

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!11

kodGreya [7K]

The first thing to do in this case is to replace the value of x = 60 in the given function to obtain the average fuel mileage in miles per gallon.
We then have to replace:
y = -0.0088 * x ^ 2 + 0.79 * x + 15
y = -0.0088 * (60) ^ 2 + 0.79 * (60) + 15
y = 30.7 mi / gal
answer
the best approximate for the average gas mileage at a speed of 60 miles per hour is
B) 30.7 mi / gal

6 0

4 years ago