Mathematics
13 Online
OpenStudy (anonymous):
Evaluate.
3 – 7 • 5 + 2 • 4
A.
–40
B.
–24
C.
–12
D.
28
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OpenStudy (anonymous):
@KamiBug
OpenStudy (kamibug):
B. -24
OpenStudy (kamibug):
3 – 7 • 5 + 2 • 4
3 – 35 + 8
-32 + 8
-24
OpenStudy (anonymous):
thanks
\[\frac{ 3.2+1.4\div7 }{9.3-7.6\times4 }\]
OpenStudy (kamibug):
\[\frac{ 3.4 }{ -21.1 }\]
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OpenStudy (anonymous):
the bottom is wrong it will not go in @KamiBug
OpenStudy (kamibug):
What do you mean? The negative sign? It can also be in the numerator, it doesn't change the value. :)
OpenStudy (anonymous):
ok can you please hold on one second
OpenStudy (kamibug):
Sure
OpenStudy (anonymous):
Evaluate the expression, using the given value of the variable.
3 – 7x + 2x when x = 3
A.
–12
B.
–24
C.
–30
D.
–18
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OpenStudy (kamibug):
3 – 7x + 2x when x = 3
Just plug in the 3.
3 - 7(3) + 2(3)
3 - 21 + 6
-24
OpenStudy (anonymous):
Evaluate the expression, using the given value of the variable.
z ÷ 3 – 5z + 4(z – 2) when z = 12
A.
–16
B.
–14
C.
–96
D.
–98
OpenStudy (anonymous):
@KamiBug
OpenStudy (kamibug):
z ÷ 3 – 5z + 4(z – 2) when z = 12
Same thing. You just gotta use substitution. :)
What does the equation look like when you plug in the value of z?
OpenStudy (anonymous):
ok is it B?
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OpenStudy (anonymous):
I do not know the answer i think -14 though?
OpenStudy (anonymous):
@KamiBug
OpenStudy (kamibug):
It's C. -96
OpenStudy (anonymous):
hold on please
OpenStudy (anonymous):
it was -16 right?
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OpenStudy (kamibug):
It's C. -96
OpenStudy (anonymous):
kk one sec i have one more:)
OpenStudy (kamibug):
Okay
OpenStudy (anonymous):
What is \[\left(\begin{matrix}n-5\times6 \\ n \div4\end{matrix}\right)\]when n = 8?
OpenStudy (kamibug):
Is it a fraction?
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OpenStudy (anonymous):
i can not get this plllllllleeeeeeeaaaaaaaaasssssssssssseeeeeeeeeeee help
OpenStudy (anonymous):
no
OpenStudy (anonymous):
it is but the answer is not a fraction:)
OpenStudy (kamibug):
Oh, yeah that's what I meant. :P Gime a sec.
OpenStudy (anonymous):
i meaN K:)
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OpenStudy (kamibug):
\[\frac{ 8-5*6 }{ 8/4 }\]
OpenStudy (anonymous):
YES
OpenStudy (kamibug):
What's 8 minus 5 times 6?
OpenStudy (anonymous):
22
OpenStudy (anonymous):
5*6 is 30-8=22
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OpenStudy (kamibug):
Well, remember the 8 is in the front. So you're doing 8-30 not 30-8. So it's guna be -22 :)
Now, what's 8 divided by 4?
OpenStudy (anonymous):
2
OpenStudy (kamibug):
Right! :) So in the numerator we have -22, and the denominator is 2. So our fraction is now -22/2. And we can divide :) What is -22 / 2 ?
OpenStudy (anonymous):
-11:)
OpenStudy (kamibug):
You've got it!:D
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OpenStudy (anonymous):
i got a 20% i failed it is ok but thanks:)
OpenStudy (kamibug):
How many questions were there in total?