ANYONE GOOD IN MATH??? please please help?

Question

please help! i dont know how to add and subtract negative number! please show me step by step thanks

6. Evaluate 18.3+x+(-20.5)+(-8) when x=30.7
7. Find the difference of -57-57
8. Evaluate -3/5-3/10+(-1/2)

Answer 1

Sweety ... were not doing your homework for you.
Ask a teacher tomorrow. It's quiet simple. If you do not understand something in your homework TRY IT and if you still can't do it ask your teacher tomorrow.

Answer 2

the easiest way is to picture a number line
example:

-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10

Of course your numbers are bigger - but bear with me.
To add a negative number you are actually subtracting. find your starting number on the line. Since you are ADDING a NEGATIVE you will move to the LEFT that many places.
so for 2+ (-4) I would start at 2 and move to the left 4 places and end up at -2.
It also works if you start from a negative and add a negative.
for -3 + (-4) I would start at -3 and move 4 to the left to -7..
A short cut for a number MINUS a negative is to make them both plusses. so 4--3 is the same as 4++3 (and you can ignore the second plus sign) Using the same method as above if you are SUBTRACTING a NEGATIVE you move the number of places to the RIGHT. so 3--4 I would start at 3 and move 4 places to the right to 7.

I hope that helped. You should be able to do your problem now.

P.S. don't forget to find common denominators on those fractions.

Answer 3

If you are adding to a number that has a negative value, you are essentially subtracting.

But how do you subtract a bigger number from a smaller one?

Example: 4+(-5) = 4 - 5 = is the same thing as 5 - 4 so the answer would be 1, except in this case the larger value is negative, so the answer would also be negative.

Another example: 9 + (-13) = 9 - 13 = -4
or: (-2) + 21 = 21 - 2 = 19

If you are subtracting negatives, you are basically adding them together, but the answer will be negative.

Example: -4 - 4 = -8

(could also be written as: -4 + (-4) = -4 - 4 = -8).

Answer 4

Yes, I am a Math Tutor in Training...in Answer to your Question of Algebra...Here is a next step for you..

1. [30.7 + 18.3] + [(-8) + (-20.5)]
2. -57 --57 = -57 + 57 = 0
(Two Minuses Make a Plus)
3. [(-3/5 x 2/2) + (-3/10) + (-1/2 x 5/5)] =
[(-6/10) + (-3/10) + (-5/10)] =
[(-6-3-5/10)]

Answer 5

6. 18.3 + x + (-20.5) + (-8)
= 18.3 + 30.7 + (-20.5) + (-8)
= 49 + (-28.5)
= 20.5

7. -57 -57
= -(57+57)
= -114

8. -3/5 - 3/10 + (-1/2)
= (-6-3)/10 + (-1/2)
= (-9/10) + (-1/2)
= -24/10
= -2(2/5) OR -12/5

Answer 6

69

Answer 7

think of a POSITIVE number as money that you HAVE in ur pocket
and a NEGATIVE as money that you OWE
so let's try this problem 56+ (-89)=
so remember NEGATIVE is money you OWE
so you owe ur friend 89 dollars : -89
remember POSITIVE is money you HAVE
and you have 56 dollars in ur pocket: 56
if you give ur friend those 56 dollars :56
you'll still owe (negative) him33 dollars (-33)
56+(-89)= -33
If you get this send me an e-mail and i will help u with the problems you wrote

Answer 8

pos + pos is pos
pos plu neg is same as subtracting neg from pos
pos minus neg is same as adding the two pos forms
neg plus neg is neg , just add the two numbers and put the neg in front
neg minus neg means make one pos and follow above rules

Answer 9

Oh come ON! If you're smart enough to use yahoo answers, these probalems shouldn't be hard for you.

Answer 10

If you can use yahoo answers, then you should be able solve these simple stuff.