Answer:
1.25
Step-by-step explanation:
Move the decimal place two spaces left to go from a percentage to a decimal. 125.0% becomes 1.25.
Answer: The concentration of X is
and the concentration of Y is
.
Step-by-step explanation:
Since we have given that
At 272 nm, absorbance = 0.215
At 327 nm, absorbance = 0.191
As we have given that
Compound X Compound Y
272 16400 3870
327 3990 6420
So, our equations becomes

By solving these two equations, we get that

Hence, the concentration of X is
and the concentration of Y is
.
Respect is definitely more important than money because money is printed everyday there is tons of it. But respect is hard to get nowadays and is even easier to lose. Have you ever stopped and thought about the meanest thing that you have said to your friend? To someone online? Does that sound like respect to you?
The answer is: [A]: 45x² + 81x + 36 .
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Explanation: Use "FOIL" technique: (First, Outer, Inner, and Last Terms);
then, combine the "like terms", to simplify.
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(5x+4)(9x+9) = 45x² + 45x + 36x + 35 = 45x² + 81x + 36 .
(which is answer choice: "A".).
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