anonymous
  • anonymous
Determine the answer to 3 + (−5) and explain the steps using a number line.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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DanJS
  • DanJS
what are you having trouble with?
anonymous
  • anonymous
i dont really understand how to find the answer
DanJS
  • DanJS
I think this wants to show you how a negative number moves left and positive to the right...so.. plus a negative number is the same as just subtraction 3 - 5

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More answers

DanJS
  • DanJS
it is saying +(move right) by (-5) which itself moves left
anonymous
  • anonymous
yea i know 3+(-5)= 3-5, but i still cant get the answer
anonymous
  • anonymous
so what your saying is go right 3 times and then lest 5
anonymous
  • anonymous
because i thought that was how u do it but i was confused
horsegal244
  • horsegal244
No its a negative
DanJS
  • DanJS
no just remember, a + (-b) = a - b plus a negative is subtraction
anonymous
  • anonymous
so is the answer -2
DanJS
  • DanJS
if you add a negative number to a value on the numberline, you move left, same as if you just had subtracted it
DanJS
  • DanJS
the other one is minus a negative number, same as just addition a - (-b) = a + b
anonymous
  • anonymous
i really need to get a good grade on this test. i did the number line and went from 0 to 3 then i went left 5 times and i got -2
anonymous
  • anonymous
is that the right answer?
DanJS
  • DanJS
oh number line... forgot
DanJS
  • DanJS
3 + (−5) start at 3, move left 5 to -2
anonymous
  • anonymous
so then i got the correct answer?
DanJS
  • DanJS
|dw:1441228943457:dw|
anonymous
  • anonymous
i dont get that
anonymous
  • anonymous
i started at 0 and went right till i got to the number 3. then i went left 5 times but started at 3 instead of 0 and i got -2. Is this right or wrong?
DanJS
  • DanJS
|dw:1441229061848:dw|
DanJS
  • DanJS
the upper one is just showing the distance between 3 and -2, not sure what you have to include on your graph
anonymous
  • anonymous
just explain how to get the answer... or how u got the answer using the number line
anonymous
  • anonymous
the explanation that i said earlier was it right or wrong
DanJS
  • DanJS
oh they want you to start at zero? then to show 3 - 5 = -2 ... start at zero, move +3, then move -5, end on -2
anonymous
  • anonymous
thank you. i really needed to make sure i had the right answer
anonymous
  • anonymous
can you help me with something else?
DanJS
  • DanJS
sure, i have a couple min
anonymous
  • anonymous
ok
anonymous
  • anonymous
Andrew is showing his work in simplifying −4.5 + 4.2 + 5.6 − 7.3. Identify any errors in his work or in his reasoning. Write feedback to Andrew explaining the mistake he made and how to correct his work. Step Work Reasoning −4.5 + 4.2 + 5.6 − 7.3 Original problem 1 −4.5 + 4.2 + 5.6 + (−7.3) Additive inverse 2 −4.5 + (−7.3) + 4.2 + 5.6 Commutative property 3 (−4.5 + (−7.3)) + (4.2 + 5.6) Associative property 4 −11.8 + 9.8 Simplify 5 −21.6 Simplify
DanJS
  • DanJS
k..
anonymous
  • anonymous
in the original problem the 7.3 is positive, why in 1. he wrote it was negative
DanJS
  • DanJS
The 7.3 is negative in the original
DanJS
  • DanJS
the only thing i see is in the simplifying step
DanJS
  • DanJS
-11.8 + 9.8 = -2 not what he wrote -21.6
anonymous
  • anonymous
but were does he make his first mistake?
anonymous
  • anonymous
In the original problem 7.3 is positive, when Allen wrote it as commutative and additive inversion, he wrote it as a negative. That was one mistake. Another mistake was that since 3.7 is not negative, he does not need an extra set of parentheses for 7.3. instead of (−4.5 + (−7.3)) + (4.2 + 5.6) it should be (-4.5 + 7.3) + (4.2 + 5.6). Since he messed up with all that, the way he simplified his answer is wrong too.
anonymous
  • anonymous
is this correct?
DanJS
  • DanJS
why are you saying 7.3 is positive? −4.5 + 4.2 + 5.6 − 7.3 was given
anonymous
  • anonymous
isnt that infront of 7.3 a subtraction
DanJS
  • DanJS
all the numbers look good to me except for the last simplifying step where he subtracted instead of added.. if the original prob is copied wrong, then i guess that too, or maybe the additive inverse thing as well...
DanJS
  • DanJS
got to run.. sorrry . be back later
anonymous
  • anonymous
ok thank you for the help

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