Mathematics
13 Online
OpenStudy (chycora):
3.
(1 pt)
What is the solution to the equation?
4(3 + 7) = 4 • x + 4 • 7
A.
x = 3
B.
x = 4
C.
x = 7
D.
x = 10
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OpenStudy (anonymous):
What do you think we do first?
OpenStudy (chycora):
4*3 +4*7
OpenStudy (anonymous):
Yes
OpenStudy (anonymous):
Now multiply them and add
OpenStudy (chycora):
15 +28
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OpenStudy (anonymous):
Actually, 4 * 3 isn't 15.
OpenStudy (chycora):
srry 12
OpenStudy (anonymous):
Yes, now add 12 + 28.
OpenStudy (chycora):
i'm actin slow today lol
OpenStudy (chycora):
40
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OpenStudy (anonymous):
Yep, so we have:
40 = 4x + 4 * 7
What's 4 * 7?
OpenStudy (chycora):
28
OpenStudy (anonymous):
Yes, so we have:
40 = 4x + 28
Now subtract 28 to both sides.
OpenStudy (anonymous):
40 - 28.
OpenStudy (chycora):
o ok i gt it kn thanx yall
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OpenStudy (anonymous):
No problem.
OpenStudy (anonymous):
You do? Then what is your answer?
OpenStudy (anonymous):
@chycora
OpenStudy (chycora):
um 3x
OpenStudy (anonymous):
No..subtract 40 - 28
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OpenStudy (anonymous):
Yes! The value of x is 3.
OpenStudy (anonymous):
Oh, I thought you meant the answer was '3x' but you meant 'x = 3'
Yes, 3 is correct.
OpenStudy (anonymous):
Because when you subtract 40 - 28, you get 12, and the equation is 12 = 4x, and when you divide 12 \(\div\) 4, you get 3. :)
OpenStudy (chycora):
k yay