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2 years ago

3 - 2n = 7 Show work please

2 answers:

4 0

Answer & Explanation-

1. 3-2n=7

2. Subtract 3 from both sides to make x alone.

3. -2n=4

4. Divide both sides by -2

5. n=-2

Answer-

n=-2

vlada-n [284]2 years ago

3 0

Answer:

-2

Step-by-step explanation:

3-2n=7

-3 -3

-2n=4

divide both sides by -2

n=-2

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Which expression is equivalent to...? Screenshots attached, please help.

BaLLatris [955]

For this case we must simplify the following expression:

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2 years ago

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goblinko [34]

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2 years ago

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I don't know this question

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2 years ago

Determine the astm grain size number if 33 grains per square inch are measured at a magnification of 270×

strojnjashka [21]

8.9

The equation for the grain size is expressed as the equality:
Nm(M/100)^2 = 2^(n-1)
where
Nm = number of grains per square inch at magnification M.
M = Magnification
n = ASTM grain size number

Let's solve for n, then substitute the known values and calculate.
Nm(M/100)^2 = 2^(n-1)

log(Nm(M/100)^2) = log(2^(n-1))
log(Nm) + 2*log(M/100) = (n-1) * log(2)
(log(Nm) + 2*log(M/100))/log(2) = n-1
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(log(33) + 2*log(270/100))/log(2) + 1 = n
(1.51851394 + 2*0.431363764)/0.301029996 + 1 = n
(1.51851394 + 0.862727528)/0.301029996 + 1 = n
2.381241468/0.301029996 + 1 = n
7.910312934 + 1 = n
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So the ASTM grain size number is 8.9

If you want to calculate the number of grains per square inch, you'd use the
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Nm(M/100)^2 = 2^(n-1)
Nm(1/100)^2 = 2^(8.9-1)
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Nm(1/10000) = 238.8564458
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Or about 2,400,000 grains per square inch.

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Step-by-step explanation:

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