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Math Problems
Grade 8
Evaluate multi-variable expressions
Evaluate each expression for
a
=
20
a=20
a
=
20
and
b
=
4
b=4
b
=
4
:
\newline
a
b
ab
ab
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Evaluate each expression for
a
=
20
a=20
a
=
20
and
b
=
4
b=4
b
=
4
:
\newline
a
−
b
a-b
a
−
b
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Evaluate each expression for
a
=
20
a=20
a
=
20
and
b
=
4
b=4
b
=
4
:
\newline
a
+
b
a+b
a
+
b
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Evaluate the expression for
m
=
4
m = 4
m
=
4
and
n
=
3
n = 3
n
=
3
.
\newline
m
n
=
mn =
mn
=
_____
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Evaluate the expression for
k
=
0
k = 0
k
=
0
and
m
=
12
m = 12
m
=
12
.
\newline
k
m
=
km =
km
=
_____
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Evaluate the expression for
c
=
2
c = 2
c
=
2
and
d
=
4
d = 4
d
=
4
.
\newline
c
d
=
cd =
c
d
=
_____
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Evaluate
8
j
−
k
+
14
8 j-k+14
8
j
−
k
+
14
when
j
=
0.25
j=0.25
j
=
0.25
and
k
=
1
k=1
k
=
1
.
\newline
_______
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Evaluate the expression for
t
=
0
t = 0
t
=
0
and
u
=
15
u = 15
u
=
15
. Simplify your answer.
\newline
t
u
5
=
\frac{tu}{5} =
5
t
u
=
_
_
_
\_\_\_
___
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What is the value of the expression below when
z
=
10
z=10
z
=
10
and
w
=
8
w=8
w
=
8
?
\newline
5
z
−
2
w
5 z-2 w
5
z
−
2
w
\newline
Answer:
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Evaluate
b
−
(
−
1
8
)
+
c
b-\left(-\frac{1}{8}\right)+c
b
−
(
−
8
1
)
+
c
where
b
=
2
b=2
b
=
2
and
c
=
−
7
4
c=-\frac{7}{4}
c
=
−
4
7
.
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Evaluate
w
+
(
−
x
)
−
2
3
w+(-x)-\frac{2}{3}
w
+
(
−
x
)
−
3
2
where
w
=
−
5
9
w=-\frac{5}{9}
w
=
−
9
5
and
x
=
4
3
x=\frac{4}{3}
x
=
3
4
.
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Evaluate
a
+
(
−
b
)
a+(-b)
a
+
(
−
b
)
where
a
=
4
a=4
a
=
4
and
b
=
2
b=2
b
=
2
.
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Evaluate the expression
1
2
x
3
\frac{1}{2} x^{3}
2
1
x
3
for
x
=
4
x=4
x
=
4
.
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Evaluate the expression
x
5
x
2
\frac{x^{5}}{x^{2}}
x
2
x
5
for
x
=
2
x=2
x
=
2
.
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Evaluate the expression
1
4
(
2
)
x
\frac{1}{4}(2)^{x}
4
1
(
2
)
x
for
x
=
5
x=5
x
=
5
.
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Evaluate the expression
x
3
+
x
2
x^{3}+x^{2}
x
3
+
x
2
for
x
=
4
x=4
x
=
4
.
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Evaluate the expression for
y
=
4
y = 4
y
=
4
and
z
=
5
z = 5
z
=
5
.
\newline
y
z
=
yz =
yz
=
_____
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