For this I got 5, however, the answer sheet says a different answer. I am a bit confused, can someone see if they get 5 as well? Also, for this problem: (8 - 7)×6 - 10/5 + 4 my answer is 0, yet the answer sheet says different. If anyone knows the answer, could they please explain, because I am lost then.
2007-08-04 07:31:06 · 12 answers · asked by ? 1 in Science & Mathematics ➔ Mathematics
After the 7 there is a slash, doesn't this mean division? why is everyone doing times?
2007-08-04 08:37:10 · update #1
(1 + 2×3) - 7/(4 - 3) + 2
(1 + 6) - 7/1 + 2
7 - 7 + 2
2
2007-08-04 07:36:02 · answer #1 · answered by McFate 7 · 0⤊ 0⤋
(1 + 2×3) - 7/(4 - 3) + 2
Remeber PEMDAS. Paranthesis first..
For the first part: (1+2×3).. multiplcation first. so
(1+6) = 7
(Original equation becomes...
7 - 7/(4-3) + 2 .... now again, paranthesis first..
The denominator of 7/(4-3)..
(4-3) = 1.. so 7/1 = 7
Original equation becomes...
7 - 7 + 2
7 - 7 = 0
so 0 + 2
= 2 (which is the answer)
Now for: (8 - 7)×6 - 10/5 + 4
Paranthesis first again...
(8-7) = 1
Original equation becomes
1 * 6 - 10/5 + 4
PEMDAS again.. From left to right, Multiplcation comes first.
1 * 6 = 6
Original equation becomes
6 - (10/5) + 4
Now.. this is where it gets a little tricky, you need to find a common denominator, because you are subtracting fractions/ Even tho 6 and 4 look like whole numbers.. they are a fraction.. they are really over the number 1
6/1 = 6, and 4/1 = 4 (6/1 and 4/1 is the fraction equivalent of 6 and 4)
Original equation becomes:
6/1 - (10/5) + 4/1 .... you are going to need a common denominator. which is going to be 5. because you can easily turn the 1's on the bottom of 6 and 4 into '5' by multiplying by 5.
You dont do anything to the 10/5 because the denominator is already 5.
((6/1) * (5/5)) - (10/5) +((4/1)*(5/5))
Equation now becomes
30/5 - 10/5 + 20/5
now that the denominators match.. you can add like normal.
(30 - 10 + 20)/5
(20 + 20)/5
40/5 = 8
So your answer is 8.
Hope this helps, and good luck!
2007-08-04 07:47:00 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Problem One
First you need to figure out what's in the parentheses, so 2 x 3 is 6, plus one is seven.
Now you have 7 - 7/(4-3) + 2
4-3 is one, and 1+2 is 3, so now you will have
7 - 7/3
Now you can either convert 7/3 to a mixed number, or 7 to an improper fraction in order to subtract.
Mixed number:
7/3= 2 1/3
7-2 1/3= 4 2/3
Improper fraction:
7= 21/3
21/3 - 7/3 = 14/3
Problem Two
It's the same thing with this one. Work the parentheses first, so you will end up with:
(1) x 6 - 10/5 + 4
1 x 6 is 6, so you can take out the one, leaving you with:
6 -10/5 + 4
10/5 is 2, so now you have
6-2 + 4
6-2 is 4, plus 4 is 8.
2007-08-04 07:48:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋
You probably did something in the wrong order. Here's the correct one:
(1 + 2*3) - 7/(4-3) + 2 = (1 + 6) - 7/1 + 2 = 7 - 7 + 2 = 2
(8 - 7)*6 - 10/5 + 4 = 1*6 - 2 + 4 = 6 - 2 + 4 [different than 6 - (2+4), which really would've given the result 0] = 4 + 4 = 8
Proper order of algebraical operations:
1. brackets (always done first)
2. multiplication, division (when there are no more brackets)
3. addition, substraction (always done last, except when in brackets)
2007-08-04 07:40:42 · answer #4 · answered by Shadow 3 · 0⤊ 0⤋
You have to remember PEDMAS,which is Prenthesis,exponent,division,multipicati... addition, subtraction (1+2x3)-7/(4-3) +2 =(1+6)-7/1 +2 =7-7+2 =2 (8-7) x6-10/5+4 =1x6-2+4 =6-2+4 =8
2016-04-01 19:42:36 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Order of Operations:
Parenthases
Exponents
Multiply
Division
Addition
Subtraction
So we go the following steps:
(1 + 2×3) - 7/(4 - 3) + 2
(1 + 6) - 7/1 + 2
(7) - 7 + 2
0 + 2
2
Second problem:
(8 - 7)×6 - 10/5 + 4
(1)x6 - 2 + 4
6 - 2 + 4
4 + 4
8
Make sure you do things in the propper order and you will always come out correct.
2007-08-04 07:36:13 · answer #6 · answered by dvc_dude_25 4 · 0⤊ 0⤋
(1 + 2x3) - 7/(4-3) +2
(1 + 6) - 7/1 +2
7-7 + 2
0+2
2
(8-7)x6-10/5 +4
1x6-2+4
6-2+4
4+4
8
For these types of problems just remember exponents, parenthesis and multiplacation and division come before addition and subtraction.
2007-08-04 07:38:57 · answer #7 · answered by ashley 3 · 0⤊ 0⤋
I dont know why But i make the answer to the first question 4
1+2=3
(3x3)-(7/1)+2
9-7+2 = 4
I make the answer to the second problem 8 as well
2007-08-04 07:50:15 · answer #8 · answered by bri 7 · 0⤊ 0⤋
(1 + [2 * 3]) - (7 / [4 - 3]) + 2
(1 + 6) - (7 / 1) + 2
7 - 7 + 2
2
Answer: For me it's 2
2007-08-07 22:34:16 · answer #9 · answered by Jun Agruda 7 · 2⤊ 0⤋
the answer is 0 because the first part of the equation comes to 0 even though the second part is 3 it would be 0/3= 0
2007-08-04 07:53:33 · answer #10 · answered by iLOVEJESUS 4 · 0⤊ 0⤋