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Blababa [14]
3 years ago
7

What's the percentage of change from 20 is decreased to 11​

Mathematics
1 answer:
Reil [10]3 years ago
3 0

Answer:

The percentage is 45 percent.

Step-by-step explanation:

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How do I solve these problems? ln(x) = 5.6 + ln(7.5) and log(x) = 5.6 - log(7.5)
SOVA2 [1]

Use the rules of logarithms and the rules of exponents.

... ln(ab) = ln(a) + ln(b)

... e^ln(a) = a

... (a^b)·(a^c) = a^(b+c)

_____

1) Use the second rule and take the antilog.

... e^ln(x) = x = e^(5.6 + ln(7.5))

... x = (e^5.6)·(e^ln(7.5)) . . . . . . use the rule of exponents

... x = 7.5·e^5.6 . . . . . . . . . . . . use the second rule of logarithms

... x ≈ 2028.2 . . . . . . . . . . . . . use your calculator (could do this after the 1st step)

2) Similar to the previous problem, except base-10 logs are involved.

... x = 10^(5.6 -log(7.5)) . . . . . take the antilog. Could evaluate now.

... = (1/7.5)·10^5.6 . . . . . . . . . . of course, 10^(-log(7.5)) = 7.5^-1 = 1/7.5

... x ≈ 53,080.96

8 0
3 years ago
Which of the following points lies on the line 2x+3y=5
Romashka [77]

Answer:

1,1

Step-by-step explanation:

Basically you enter this equation into a graphing calculator and see which x and y value match and those are your points . Or you can substitute values in for x by isolating y by itself

5 0
3 years ago
C = 5(f-32) / 9 in form ac + b / c
Lera25 [3.4K]

Answer: I don't know if you wanted me to solve for C or F. But, I Solved for both.

Step-by-step explanation:

<u>Solved for F </u>

  • f=(9C)/(5)+32

<u>Solved for C</u>

  • C=(5(f-32))/(9)
3 0
3 years ago
HELP GEOMETRY PROOFS
Reptile [31]

Step-by-step explanation:

See the attached for the proof

6 0
3 years ago
4x10^5 scientific notation
dmitriy555 [2]
This is already written in scientific notation, but if you are asking what the answer would be written out it is: 400000
8 0
3 years ago
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