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2 years ago

Neeed helps math help no links or imma report helps 20 points

Mathematics

1 answer:

Ivan2 years ago

8 0

The answer to the question u asked is A

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If 800g of a radioactive substance are present initially and 8 years later only 450g remain, how much of the substance will be p

artcher [175]

A=Pe^(rt)

P = 800g

t = 8 years

A = 450g

r = This is what we will try and find to start with

450=800e^(r*8)

After running the math through a calculator, we end with r = -0.07192

Now we just re-input this information into our equation: A=800e^(-0.07192*16)

A=800e^(1.15072)

Now we will re-write the equation using the negative exponent rule:

A = 800 1/e^1.15072

Combine right side:

A = 800/e^1.15072

Then do the math:

A = 253.12709836......

That will give us A = 253 (rounded to the whole number)

I hope this helps! :)

5 0

3 years ago

the jonsons purchased an air conditioner.Should they set the thermostat at 18 degrees Celsius or 50 degrees Celsius

Neko [114]

18 Celsius because it is 64.4 in Fahrenheit which is a natural temperature and 50 is 122 in Fahrenheit which is very hot.
Hope I was helpful!

6 0

3 years ago

Help help help help pls

Monica [59]

Answer:

$\theta = 82.2^\circ$

Step-by-step explanation:

$Let \ \angle BAC = \theta$

Opposite = BC ,

Adjacent = AB = x = 3 ,

Hypotenuse = AC = y = 22

<em><u>Using trigonometric ratios.</u></em>

$sin \theta = \frac{opposite}{hypotenuse }\\\\cos \theta = \frac{adjacent}{hypotenuse}\\\\tan \theta = \frac{opposite}{adjacent}$

Since we have adjacent and hypotenuse we use cosine's ratio

to find the angle.

$cos \theta = \frac{x}{y} = \frac{3}{22} \\\\\theta = cos^{-1} \frac{3}{22} = 82.16 = 82.2^\circ$

6 0

3 years ago

To the nearest 1000, there are 18,000 people at a festival . Write down the minimum possible number of people at the festival

Andreyy89

Answer:

17500

Step-by-step explanation:

17499 rounds down

17500 rounds up

8 0

3 years ago

What is the range of the following relation?

denis23 [38]

The range of a relation is the set of the outputs of the relations.

The outputs are

$\{1, 2, 3, 4, 5\}$

And this is the range.

3 0

3 years ago