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olga_2 [115]
3 years ago
14

In chemistry lab, there are 9.52 grams of powdered substance in a container. Max needs to place substance into each of 3 glass p

lates. The amount of powdered substance he places into each glass plate is 1.98 grams. Max estimates that there are 4.5 grams of the powdered substance in the container. Is the statement reasonable?
Mathematics
1 answer:
tatyana61 [14]3 years ago
5 0
A is the answer because it is
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For what values of k
sergey [27]

If y = cos(kt), then its first two derivatives are

y' = -k sin(kt)

y'' = -k² cos(kt)

Substituting y and y'' into 49y'' = -16y gives

-49k² cos(kt) = -15 cos(kt)

⇒   49k² = 15

⇒   k² = 15/49

⇒   k = ±√15/7

Note that both values of k give the same solution y = cos(√15/7 t) since cosine is even.

3 0
3 years ago
PLEASE HELP For what value of the variable will the value of 2x+1 be 20 greater than 8x+5?
wlad13 [49]

It will be a negative.

for an example: -20 for x would mqke 2x + 1 into -39 and 8x + 5 into -155. that's 116 apart, so maybe -2(8) + 5 = -11

-2(2) + 1 = -3

but that's only 8 apart, so it'd be higher.

-4(2) + 1 = -7

-4(8) + 5 = -27

BOOM

Tadaaaa,

You probably thought positive, but sometimes it's negative, you know what I mean?

6 0
3 years ago
Jenna worked at an ice cream cart for 8.75 hours on Friday, 7.5 hours on Saturday she made a total of 178.25 How much does Jenna
Musya8 [376]
Jenna gets paid a total of 10.97 cents an hour<span />
4 0
3 years ago
Read 2 more answers
FINALS HELP SORRY!!!!!!
monitta
I believe the 4th one
an=145+an-1 and a1=20
4 0
3 years ago
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The ____ of ____ property allows you to rewrite . xa· xb as xa + b.
gregori [183]
The rule of distributive property allows you to rewrite xa + xb as x (a + b).

So if x = 2, a = 3 and b = 4, xa + xb = x(a + b)
(2 * 3) + (2 * 4) = 2 (3 + 4)
6 + 8 = 14
14 = 14
...and so on. You may try it yourself with different variations.

Thank you for posting your question. I hope you found what you were after. Please feel free to ask me more.

 

 

<span> </span>

7 0
3 years ago
Read 2 more answers
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