Margaretsponge

Margaret Crewdson

__9/22/08__ 65. 4.78+0d=4.78d                               correct 66.-21p-76p^2-9+p=-20p-76p^2-9              correct 67.3.3t^2+8.7t-9.4t^2+5t=-6.1t^2+13.7t                       correct 68.1.5m-4.2m-12.5v+4.2m=1.5m-12.5v                                        correct

9/24/08 1.-1/9       correct 2.-20                     correct 3.5                                    correct 5.2*4(-3*-5) 8*15= 150        incorrect 6.-4+5=1                                             incorrect 7.(2*4^2)/(4*-5)=32/-20=?                        incorrect 8.?                                                                                incorrect 9.1/3(24x-36)=72x                                                          incorrect 10.                                                                                                   incorrect

__9/25/08__ Done on paper laptop being fixed __9/26/08__ The associative property is when you change the grouping of an equation only for addition or multiplication. For example, 3x+(2-5) if you use the associative property you will get (3x+2)-5. The commutative property is when you can change the order of the numbers in an equation. For example, 2s+4g-8p*6s if you use the commutative property you will get 2s*6+4g-8p.

__10/1/08__ 15.14k²-(-2k²)=16k² 16. 4xy+9xy=13xy 17. 6t+2-4t=2t+2 18.9x-4+3x=12x-4 Extra. 15/7 +- 3/6= 90/42+-21/42= 69/42

__10/2/08__ 1.x-5=14   ~ x+5=x     ~5+14=19     ~x=19 2. x+3.8=9  ~x-3.8=x    ~9-3.8=5.2       ~x=5.2 3. -7+x=7  ~x+7=x       ~7+7=14   ~x=14 4.x-13=20    ~x+13=x    ~-13+20=32    ~x=32 5.x÷4=8  =x*4=x=4*8=32=x=32 6.9=3x   ~x÷3=x    ~9÷3=3    ~x=3 7.10x=2   ~x÷10=x       ~10÷2=1/5   ~x=1/5 8.2/3x=-6    ~2/3÷x=x    ~2/3÷-6=-1/6*2/3=-18/2     ~x=-18/2=    x=-9 9.x+23/4=61/2   ~x-11/4=x   ~11/4-26/4=15/4     ~x=15/4

__10/3/08__ 40.8+c/-4=-6=c/-4=-14*-4=56   =c=56=  8+56/-4=-6 41.7-3k=-14 =3k=-7  -7÷3=-2.334     =k=7  =7-3*7=-14 42.14=6-2p=20=2p=20÷2 =p=-4   =14=6-2*-4 43. -y/2+14=-1 -y/2=-15=-15÷-1=15*2=30=-30/2+14=-1

__10/6/08__ 5.4x+3=-5 4x=-11 __x=-2__  4*-2+3=-5 6. -1x+7=12  -1x=5  __x=-5__  -1x*-5+7=12 7. 2t-8t+1=43 -6t+1=43  -6t=42  __t=-7__  2*-7-8*-7+1=43 8. 0=-7n+4-5n 0=-12n+4 -12n=-4  __n=1/3__   0=-7n+4-5n 29. 1/5+3w/15=4/5 3+3w=12 3w=9    __w=3__   1/5+3*3/15=4/5