Date
Practice
1-3
Form K
I
Algebraic Expr,essions
Write an algebraic expression that models each word phrase.
r
To start, relate what you know.
1. six less than the number
Describe what you need to
"Less thanoo means subtraction.
find. Begin
with the number r and subtract 6.
y-(P
2. twelve more than the number b
b+tx
3. five times the sum of 3 and the number rz
5(j+
rt't)
Write an algebraic expression that models each situation.
4. Alexis has $250 in her savings account and deposits $20 each week for w weeks.
Le+ H --n,r,.,*>ct
ol
Netbs
Jflrao61
5. You have 30 gallons ofgas and you use 5 gallons per day for d days.
L*
J-- rurnlr< u+ da.l
ZD-s)
s
Evaluate each expression for the given values of the variables.
6.-2a + 5b + 6a- 2b *
a;a:-3
andb
=2
To start, substitute the value
for each
"Zeh
kY
-2(-3) + s(2) + 6(-3) - 2(2) + (-3)
Ltto-fi-,t-b
7.il3-x)+*;x:2andy:12
re(3-A+ ?*'- tx(il++= t1+(@
8. 3(4e - zfl + 2(e + \fl; e : -3 andf : 10
attrr)-eto)+ x(-3+r (ror) ' 3(e,-ao) + *('7+
$qt
-- 3(u) *tF1)'-
The expression 6l represents the surface area ofa cube with edges oflength s.
What is the sur{ace area of a cube with each edge length?
9. 4 centimeters
10.2.5 feet
b0.9e = G(b ,("5)
L(,$ -- tu1u)-.2
q
b Cnr
Prentice Hall Foundations Algebra
2.
Teaching Resources
Copyright @ by Pearson Education, Inc., or its afiiliates. All Rights Reserved.
25
-1t + t54=
@
Date
Class
Name
Pfacticg
1-3
Form K
lcontinued;
Algebraic Expressions
Write an algebraic expression to model the total score in each situation.
Then evaluate the expression to find the total score.
11. In the first half, there were fifteen two-point shots, ten three-point shots and
5 one-point free throws.
To start, define your variables. Let w : the number of two-point shots,
r : the number of three-point shots, andf : the number of one-pojnt free throws.
Jw+ 3r
+rf
a{s)+ 3(ro) * tt_sfi
3cl + ?et+s :
I extra point kick.
Hint: A touchdown is worth 6 points. An extra point kick is worth I point.
lck L=nurnhr-r oQ +ourlAdr^r,1E
0r(4) llCr)
13* k--rr,*t^tr*r6 oP ex*ra5o \r* krd.s
,7-{., =
Simpli$ by combining like terms.
12. In the first quarter, there were two touchdowns and
t++\k
13.10b
-
'r4. 12 + 8s
b
qb
-
l
I 3eo;ds
3s
te *5s
16.5m+2n+6m+4n
15.3a+2b+6a
lln + OA
Qa+ab
17.8r-(3s-5r)
8r - ZS-r5r
18.2.5v
-
4v
AD
--
The expregsion 19.95 + 0.05x models a household's monthly Internet charges,
wherex represents the number of online minutes during the month. What are
the monthly charges for each number of online minutes?
19.65 minutes
rcl,?S+ o,os(/a{) =
20.128 minutes
tq,qs* o.o{0>?)= r?,?Sr
t*&6t3{
tq,Kr 3,eS
,o"ro"**ffi.n
L,'l
for the given value of the varia
22.x-5(x+2);x:-5
- s1yi-r+a) ='+
21.3a+(2a+6);a:2
3t+ (atr> *);b(q+o>'
L+-,9'-@
l);r:4
-,{+ (a1,+z}* ) = -4* b(q+i,
- et (*8*1 = - 11+q.
23.-r + (31+
24.*
rk!
=
-rrti-*ir!,{:;o@
: loo - s(*ta7-'
/oo- r(w)= too'fu:
,&t(?c,o)-
Prentice Hall Foundations Algebra
2.
ta.)
Teaching Resources
Copyright @ by Pearson Educatibn. lnc., or its affiliates. All Rights Reserved.
26
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