CallieSponge

Callie Bergin

September 25 p(85,1-3, 5-10)

1) (-1/3) + (2/9) = 1/9

2) -20

3) 5

5) 120

6) 1

7) -1.6

8) t= temperature change, -5+t, 8'F

9) 8x-12

10) 49t

September 26 p(91, 1-4)

1) -(y-4) yes 4-y

2) 8+5m no 8+5+m

3) 2(t-7) no (2(a-18)

4) 4(2b-3) no (2[(2-1)b-2]

September 29 properties

1) Associative property- the regrouping of numbers produces the same answer in multiplication or addition problems.    - (a+b)+c= a+(b+c)

2) Commutative property- is adding or multiplying numbers in any order and produces the same answer.     - axb=bxa

October 1 p(116-15-18)

15) 14k^2-(-2k^2)= 16k^2

16) 4xy+9yx= 13xy

17) 6t+2-4t= 2t+2

18) 9x-4+3x= 12x-4

1) 15/7+-3/6=90/42+-21/42= 23/14

October 3 p 119 (1-9)

1) x-5= 14      +5   +5         x = 19 19-5= 14 14=14

2) x+3.8= 9      - 3.8   -3.8             x= 6.2 6.2+3.8= 9 9=9

3) -7+x= 7   +7        +7            x= 14 -7+17= 7 7=7

4) x-13= 20      + 13  + 13            x= 33 33-13= 23 20=20

5) x/4= 8      *4    *4         x= 32 32/4= 8 8=8

6) 9 =3x   /3   /3     3 =x 9 =3*3 9=9

October 6 p122(40-43)

40) 8+c/-4= -6      -8              -8 c/-4= -14 c= 56 8+56/-4=-6
 * -4    *-4

41) 7-3k= -14     -7          - 7 -3k=-21 /3      /3 k= 7 7-3*7=-14

42) 14= 6-2p       -6  -6 8= -2p /-2 /-2 -4= p 14 =6-2*-4

43) -y/2+14=-1               -14   -14 -y/2= -15*2 1/y=-30/-1 /1 y=30 -30/2+14=-1