Pr act i ce an d Pr o b l em - So l v i n g Ex er ci ses
PracticeQ ApplyUse a number line to find each sum.- 2 + 5
- -6 + 9
Find each sum.- 11+9
- 1 4 + ( - 10 )
- -2 .2 + (-3 .8 )
Find each difference.- 5-15
- -2 9 -(-1 1 )
- -2 .9 - (-7 .5 )
11. -3 + 8
15. -4 + 7
19. 17+ (-28)
23.
27.31.35.9 + ( - 2 )H-i)
-1 3 -7-7 -(-5 )- 3.5 - 1.9
MATHEMATICAL
PRACTICES- 4 + (-3 )
- 6 + ( - 8 )
- 12 + (-9 )
- 3.2 + 1.4
28- - § + ( - § )- -1 9 -7
- 8.5 - 7.6
- b — T
See Problem 1.- 1 + ( - 6 )
- -9 + (-3)
See Problem 2.
- 2 + 7
- 5.1 + ( - 0 .7 )
- k +(-ft)
- Bird Watching A n e a g le s ta rts f ly in g a t a n e le v a t io n o f 4 2 ft. E le v a t io n is th e
distance above sea level. The diagram below shows the elevation changes during
th e e a g le ’s f lig h t. W r it e a n e x p r e s s io n r e p r e s e n t in g t h e e a g le ’s f lig h t. W h a t is t h e
e le v a t io n a t th e b r o o k?
Up 144 ft
See Problem 3.- 36-(-12)
- -2 .5 - 17.8
ft-(4)
See Problem 4.41.- Stock M arket A s to c k 's s t a r t in g p r ic e p e r s h a re is $ 5 1 .4 7 a t t h e b e g in n in g o f th e
w e e k. D u r i n g th e w e e k , t h e p r ic e c h a n g e s b y g a in in g $ 1 .2 2 , t h e n lo s in g $ 3 .4 7 ,
t h e n lo s in g $ 2 .1 1 , t h e n lo s in g $ .9 8 , a n d f i n a l l y g a in in g $ 2 .4 1. W h a t is t h e e n d in g
s to c k p ric e?
Evaluate each expression for a = -2,b = —4. 1 , a n d c = 5.- a — b + c 45. —c + b — a 46. —a + ( —c)
- Error Analysis D e s c r ib e a n d c o r r e c t th e e r r o r i n f i n d i n g th e d iffe r e n c e
shown at the right. - W riting Without calculating, tell which is greater, the sum of —135
a n d 2 5 7 o r th e s u m o f 135 a n d —2 5 7. E x p la in y o u r r e a s o n in g.
34 Ch ap t er 1 Fo u n d at i o n s f o r A l g e b r a