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natali 33 [55]
3 years ago
12

A fish tank has 42 gallons of water and is being drained at a rate of 2 gallons per minute. Another tank is empty and is being f

illed at a rate of 4 gallons per minute. After how many minutes will both tanks have the same amount of water?
Mathematics
2 answers:
vredina [299]3 years ago
7 0

Answer:

6 mins and 30 secs

Step-by-step explanation:

AveGali [126]3 years ago
3 0

Answer:

6 mins and 30 secs

Step-by-step explanation:

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This problem addresses some common algebraic errors. For the equalities stated below assume that x and y stand for real numbers.
weqwewe [10]

Answer:

The answers are:

a) (x+y)^2 = x^2 + y^2 is FALSE.

b) (x+y)^2 = x^2 + 2xy + y^2 is TRUE.

c) \frac{x}{x+y}= \frac{1}{y} is FALSE.

d) x-(x+y) = y is FALSE.

e) \sqrt{x^2} = x is FALSE.

f) \sqrt{x^2} = |x| is TRUE.

g) \sqrt{x^2+4} = x+2 is FALSE.

h) \frac{1}{x+y} = \frac{1}{x} + \frac{1}{y} is FALSE.

Step-by-step explanation:

We can show that the FALSE statement are, in fact, false finding an example where the equality fails.

a) Take x=2 and y=3 and notice that (2+3)² = 25, while 2²+3²=4+9=13.

b) (x+y)² = (x+y)(x+y)=x²+xy+xy+y² = x² +2xy +y².

c) Take x=2 and y=3 and notice that 2/(2+3) = 2/5 which is different from 1/3.

d) Take x=2 and y=3 and notice that 2-(2+3) = 2-5=-3 which is different from 3. Recall that x-(x+y) = x-x-y=-y.

e) Take x=-2, and notice that [tax]\sqrt{(-2)^2} = \sqrt{4} = 2[/tex] which is different from -2.

f) The previous example illustrate why this is true.

g) Take x=1, and notice that sqrt{1^2+4} = \sqrt{5} which is different from 3.

h) Take x=2 and y=3 and notice that 1/(2+3)=1/5 and 1/3+1/2 = 5/6.

3 0
3 years ago
A teacher keeps track of how many books are read by students in each class. Which grade has read has read a higher rate hook per
12345 [234]
For the answer to the question above asking h<span>ow many more book does the other grade need to read to have the same rate?
I think the answer here is </span>the 7 grader needs to read 94 more books in order to catch up with 6 grade.
6 0
3 years ago
Read 2 more answers
A certain 5-digit combination lock can be reset with a new combination. The lock uses numbers from 1 to 6. After a friend accide
daser333 [38]
The probability is (1/6)^5 power. Since the locks are independent of each other, you can multiply the probabilities together. There are 6 possible numbers for each lock and there are 5 locks. So the probability is (1/6)^5 power.<span />
5 0
3 years ago
What is the missing number in the ratio table?<br> 5 15<br> 7 <br> 9 27<br> 11 33<br> 13 39
PSYCHO15rus [73]

Answer:

21

Step-by-step explanation:

the numbers are multiplying by 3

7 0
3 years ago
(4.4x10^-6)x(3.9x10^2) in correct scientific notation
ddd [48]

Answer:

1.716*10^-3

Step-by-step explanation:

(4.4*10^-6)*(3.9*10^2)=0.001716

To convert 0.001716, we need to move the decimal places three places to the right to make sure the number is between 1 and 10. Moving three places to the right makes the exponent negative.

5 0
4 years ago
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