Mathematics
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OpenStudy (winsteria):
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 (winsteria):
@Zerrena27
OpenStudy (danjs):
4(10)=4x + 28
OpenStudy (danjs):
40-28 = 4x
OpenStudy (danjs):
12 = 4x
x=3
OpenStudy (winsteria):
So A?
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OpenStudy (danjs):
well test it by putting 3 in for x and see if both sides are equal
OpenStudy (winsteria):
yay it is can you help me with another one?
OpenStudy (danjs):
sure
OpenStudy (anonymous):
Me as well.
OpenStudy (winsteria):
Okay
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OpenStudy (winsteria):
Use the distributive property to rewrite the expression and solve.
9 ∗ 72 = 9 ∗ [?] + 9 ∗ 2 = [?]
OpenStudy (winsteria):
reload if there's the question mark glitch oops
OpenStudy (danjs):
ok
OpenStudy (anonymous):
Ok, this a hard one.
OpenStudy (anonymous):
x=3.
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OpenStudy (danjs):
648 = 9x +18
OpenStudy (danjs):
i think you wrote it wrong
OpenStudy (anonymous):
yeah would it be 4?
OpenStudy (danjs):
rewrite using parethesis
OpenStudy (winsteria):
Here I took a picture of the question
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OpenStudy (anonymous):
@Zerrena27 no its not. You just plug in the numbers and solve. I got 3
OpenStudy (danjs):
is it
9*72 = (9*x)+(9*2)
OpenStudy (anonymous):
Oh, I'm so dumb.
OpenStudy (danjs):
so
9*72 = 9(x+2)
OpenStudy (anonymous):
I didn't say that Zerrena
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OpenStudy (anonymous):
I know, but i'm getting wrong answers.
OpenStudy (danjs):
i c
OpenStudy (anonymous):
me too, i think I got it.
OpenStudy (danjs):
9*72 = 9*36 + 9*2 = 648
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OpenStudy (anonymous):
Yes!
OpenStudy (danjs):
they just want you to factor the 72 into 36*2
OpenStudy (anonymous):
Danjs you got a fan!
OpenStudy (winsteria):
So in the first box I put 36 and in the second one I put 648?
OpenStudy (danjs):
yea
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OpenStudy (winsteria):
Thank you so much
I HAVE ONE MORE CAN YOU HELP?
OpenStudy (anonymous):
Yea
OpenStudy (danjs):
sure
OpenStudy (anonymous):
what do medals do?
OpenStudy (winsteria):
They're just like awards?
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OpenStudy (danjs):
not sure, i just started this site yesterday
OpenStudy (danjs):
just here for fun. hah
OpenStudy (anonymous):
I started today
OpenStudy (anonymous):
Whoa, what grade are you in?
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OpenStudy (danjs):
12.2
239.12
OpenStudy (anonymous):
Is this area or perimeter?
OpenStudy (danjs):
me?
OpenStudy (anonymous):
yea
OpenStudy (danjs):
oh, 4th year mechanical engineering. lol
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OpenStudy (winsteria):
So do you know what the answer is?
OpenStudy (danjs):
i put them both above
OpenStudy (danjs):
That problem was just factoring out the 2
OpenStudy (danjs):
to rewrite the expression , then just calculate it
OpenStudy (danjs):
12.2
239.12
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OpenStudy (winsteria):
so the first box is 12.2 the second box is 239.12?
OpenStudy (danjs):
yes
OpenStudy (danjs):
wait
OpenStudy (winsteria):
The seconds box won't let me put in 239.12? it says its too big of a number
OpenStudy (danjs):
44
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OpenStudy (danjs):
second box is 44
OpenStudy (danjs):
2*(12.2+9.8) = 2*22 = 44
OpenStudy (winsteria):
the first one is still 12.2 right?
OpenStudy (danjs):
yes
P = 2*l + 2*w = 2(l+w)
OpenStudy (danjs):
it is just factoring out a 2
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OpenStudy (winsteria):
okay and can you check this other answer of mine I just want to make sure it's right?
OpenStudy (danjs):
ok
OpenStudy (winsteria):
I think it's A
OpenStudy (winsteria):
oh wait did you already help me with that one o_o
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OpenStudy (danjs):
4(3+7) = 4*x + 4*7
Using the same process as the last problem, factor out a 4 from the
4(3+7)
OpenStudy (danjs):
= 4*3+4*7
OpenStudy (winsteria):
is my answer right or no?
OpenStudy (danjs):
i mean distribute the 4 into the parenthesis
OpenStudy (winsteria):
ok
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OpenStudy (danjs):
right
a*(b+c) = a*b + a*c
OpenStudy (winsteria):
ok I'm right :)
OpenStudy (winsteria):
I need help with checking another one
OpenStudy (danjs):
ha ok one more, then open a new thread
OpenStudy (winsteria):
okay