Math People, used 2 b my fave Subject... Now i practically Hate it! :P
Which expression is equivalent to the given expression?
13(19 – x)
A.
13 • 19 – 13x
B.
1319 – 13x
C.
13 • 19 – x
D.
13 + 19 – 13 + x
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OpenStudy (sissyedgar):
@misty1212
OpenStudy (misty1212):
lol it is not so bad dear one
OpenStudy (misty1212):
first one is \[13(19-x)\] and the distributive law says
\[a(b+c)=ab+ac\] so
\[13(19-x)=13\times 19-13\times x\]
OpenStudy (sissyedgar):
a.k.a...... A.
OpenStudy (sissyedgar):
Combine like terms.
8 + 6x – 11x + 12
A.
20 – 5x
B.
20 – 17x\
C.
20 + 5x
D.
14x + 1x
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OpenStudy (sissyedgar):
uhhhg... all these ????????????
OpenStudy (misty1212):
hold on i got the question marks of death here
OpenStudy (misty1212):
ah c'mon don't be a sissy!\[8+6x-11x+12\] what is \(8+12\)
OpenStudy (sissyedgar):
ikr
OpenStudy (anonymous):
combine like terms for this one \[8+12=20\] and \[6-11=-5\]
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OpenStudy (anonymous):
so final answer \[20-5x\] hope that is a choice
OpenStudy (sissyedgar):
it is thx!
OpenStudy (misty1212):
@sissyedgar you got that ? it is not really that hard, just adding is all
OpenStudy (sissyedgar):
lol.. yea but them fractions and lettes are just uhhg
OpenStudy (misty1212):
i didn't see a single fraction ...
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OpenStudy (sissyedgar):
o yea... i was lukin @ the next problem! :P
OpenStudy (sissyedgar):
that fraction! :P
OpenStudy (misty1212):
\[\frac{x+2}{3}=-4\] right?
OpenStudy (sissyedgar):
rite... how u do tht tho?
OpenStudy (misty1212):
get rid of the annoying fraction by multiplying both sides by 3
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OpenStudy (misty1212):
the 3 cancels on the left, on the right you get \(-4\times 3=-12\)
OpenStudy (sissyedgar):
lol...
OpenStudy (sissyedgar):
rite
OpenStudy (misty1212):
in other words the whole thing is the same as
\[x+2=-12\] and you can solve that in one step
OpenStudy (sissyedgar):
x = -14?
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OpenStudy (misty1212):
yup
OpenStudy (sissyedgar):
yay!
OpenStudy (sissyedgar):
Evaluate the expression by using the given values of the variables.
y ÷ 3 • 2 – 8 ÷ x + 5 where x = 4 and y = 12
A.
11
B.
9
C.
21
D.
5
OpenStudy (misty1212):
\[\color\magenta\heartsuit\]
OpenStudy (misty1212):
got a calculator?
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OpenStudy (misty1212):
\[12\div 3\times 2-8\div 4+5\]
OpenStudy (misty1212):
they are trying to trick you here
OpenStudy (sissyedgar):
i c
OpenStudy (misty1212):
start with \(12\div 3\)
OpenStudy (sissyedgar):
4
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OpenStudy (misty1212):
ok then \(4\times 2\)
OpenStudy (sissyedgar):
8
OpenStudy (misty1212):
ok then put that aside and compute \(8\div 4\)
OpenStudy (sissyedgar):
2
OpenStudy (misty1212):
now we knock it out
\[8-2+5=?\]
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OpenStudy (sissyedgar):
i add 1st rite? cause PEMDAS
OpenStudy (misty1212):
oh no pemdas is a trick bad math teacher play on unsuspecting students
work form left to right
OpenStudy (sissyedgar):
o, ok 11
OpenStudy (misty1212):
\[8-2=6\\
6+5=11\]
OpenStudy (misty1212):
yeah 11
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OpenStudy (sissyedgar):
|dw:1423538266892:dw|
OpenStudy (misty1212):
\[\frac{z-5}{7}=-1\\
z-5=-7\] you can finish it i am sure