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STALIN [3.7K]
2 years ago
9

A chemist has three different acid solutions. The first acid solution contains 25%

Mathematics
1 answer:
PilotLPTM [1.2K]2 years ago
8 0
Solution:
Let the volume (in litres) of acids used be:
x1=amount of 25% acid
x2=amount of 40% acid
x3=3*x2=amount of 60% acid
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Is 23/100 a rational number
Anna35 [415]

Answer:

YES

Step-by-step explanation:

A rational number is a number that can be expressed as the quotient or fraction p/q of two integers

- 23 and 100 are both integers

- 23 / 100 = 0.23 which is not a continious decimal

5 0
2 years ago
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Which expression is equivalent to (4 + 6i)2?
larisa86 [58]
\bf \textit{recall that }i^2=-1\\\\
-------------------------------\\\\
(4+6i)^2\implies (4+6i)(4+6i)\implies 16+24i+24i+36i^2
\\\\\\
16+48i+36(-1)\implies 16+48i-36\implies -20+48i
8 0
3 years ago
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If a country has a GDP of $100 and a population of 10, what is their GDP Per Capita?
Nataly [62]

Answer:

$10

Step-by-step explanation:

Per capita means per person, so divide the GDP by the number of people.

$100/10 = $10

6 0
2 years ago
100 POINTS!!!!!!!!
yawa3891 [41]

Form the confidence level (99%), we calculate the "alpha" value

alpha=1-(99/100)=0.01

Now, calculate the critical probability (p-start)

p*=1-(alpha/2)=1-(0.01/2)=0.995

z-score could be calculated from p*,,,

z-score=2.57583

Now, calculate the Margin of Error:

standard deviation = s

number of adults = n

ME=(z*s)/(sqrt n)=(2.57583*12)/(sqrt 250) = 1.955

The confidence interval = mean +or- ME

                                     = 70+1.955  or  70-1.955

So that we can conclude that the 99% confidence interval for the mean beats per minute is 68.045 and 71.955

I hope you got the idea!

5 0
3 years ago
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25. Write the following definition as a biconditional.
cestrela7 [59]

Answer:

A phrase is an oxymoron if and only if it contains contradictory terms.

Step-by-step explanation:

A conditional statement is a statement written in the "if-then" form.

The converse of a conditional statement is when the hypothesis and the conclusion is interchanged.

A biconditional statement is a combination of a conditional statement and its converse written in the  "if and only if"   form.

Given statement:

  • An oxymoron is a phrase that contains contradictory terms.

<u />

<u>Conditional</u>:  If a phrase is an oxymoron then it contains contradictory terms.

<u>Converse</u>:  If a phrase contains contradictory terms then it is an oxymoron.

<u>Biconditional</u>:  A phrase is an oxymoron if and only if it contains contradictory terms.

8 0
1 year ago
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