4/5+6/9+1/2-7/2=help!!!!!!!!!!!!!!?

First things first: find a common denominator (90). Convert all fractions to #/90:

(72/90) + (60/90) + (45/90) - (315/90) =

Leaving out the /90 for a bit, we perform addition and subrtaction in the PEMDAS, or "Please Excuse My Dear Aunt Sally", form:

72 + 60 + 45 - 315 = -138

The fraction is (-138/90) which can be further simplified to (-69/45) and then to (-23/15). Converting to a whole number, albeit negative, your answer is:

-1 8/15

that's the answer: -1.533

The second fraction can be reduced to 2/3:

4/5 + 2/3 + 1/2 - 7/2

The last two fractions become -6/2 or -3

So now you have:
-3 + 4/5 + 2/3

Get a common denominator of 15:
-45/15 + 12/15 + 10/15
(-45 + 12 + 10) / 15

-23 / 15

Most teachers want the answer as a mixed number...

Answer:
-1 8/15

You did it!

4/5+6/9+1/2-7/2
4/5=72/90
6/9=60/90
1/2=45/90
7/2=315/90
=>
4/5+6/9+1/2-7/2= 72/90+ 60/90 + 45/90 + 315/90 = -138/90 = -23/15 = -1 8/15

4/5 + 2/3 - 6/2
24/30 + 20/30 - 90/30
- 46/30
-23/15

4/5 + 6/9 + 1/2 - 7/2
4/5 + 2/3 - 6/2
2/3 - 11/5
-23/15

Answer: -23/15

4/5 + 6/9 + 1/2 - 7/2
= 4/5 + 2/3 + 1/2 - 7/2
= (4 x 6)/(5 x 6) + (2 x 10)/(3 x 10) + (1 x 15)/(2 x 15) - (7 x 15)/(2 x 15)
= 24/30 + 20/30 + 15/30 - 105/30
= -46/30
= -23/15
= -1 8/15

Your answer is correct.

Do it in steps

1/2 - 7/2 = -6/2

4/5 + 6/9 = 36/45 + 30/45 = 66/45

66/45 - 6/2 = 132/90 - 270/90 = -138/90 (divide by 6) = -23/15