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Oksanka [162]
4 years ago
11

Help with these questions? Thanks

Mathematics
1 answer:
Aleks [24]4 years ago
3 0
Well, I'll answer this problem:
<span>mercury-197 has a half life of about 64 hours. After 288 hours about how many miligrams of a 750mg sample

According to this site:
http://www.1728.org/halflife.htm

Ending Amount = Beginning amount / 2^n
where "n" is the number of half-lives (elapsed time / half-life)

</span>"n" =288 / 64 = 4.5
<span>Ending Amount = 750 mg / 2^4.5
</span>Ending Amount = 750 mg / <span><span>22.627416998 </span>
</span>Ending Amount = <span><span><span>33.146 mg
Answer is 33 milligrams


</span></span></span>
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Explain how you could use the distribute property and mental math to find 5 times 198
Sladkaya [172]
Multiply 100 times 5 in your head to get 500, 

100 * 5 = 500
90 * 5 = 450
8 * 5 = 40
Put those 3 together into one equation, \/
(100 * 5) + (90 * 5) + (8 * 5) = 990 OR (100 * 5) + (98 * 5) = 990
depends on how distributed the teacher wants it to be.
5 0
4 years ago
If p = -2 and q = 5, is the value of p/q equivalent to 2/5?
grandymaker [24]

Answer:

No.

Step-by-step explanation:

1. Subsutute p/q with the numbers given, p = -2 and q = 5.

-2 / 5.

2. Divide 2/5 and -2/5 and compare.

2 / 5 = 0.40

-2 / 5 = -0.40

-0.40 < 0.40

If they are not =, then they are <u>NOT</u> equivalent.

Which means, they are Not equivalent.

5 0
3 years ago
What is the gcf of 18 and 9?
Zanzabum
The gcf of 9 and 18 is 18
8 0
3 years ago
Read 2 more answers
Which expression is equivalent to √-80?<br> 4√5<br> -4√5<br> -4i √ 5<br> 4i √ 5
miskamm [114]

Answer:

  4i√5

Step-by-step explanation:

\sqrt{-80}=\sqrt{(-1)(16)(5)}=\sqrt{-1}\cdot\sqrt{16}\cdot\sqrt{5}=4i\sqrt{5}

6 0
3 years ago
PLEASE ANsWer THiS<br> Question in picture ⬇️<br><br> There are two
olasank [31]

Answer:

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Step-by-step explanation:

6 0
3 years ago
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