1.
Evaluate 3
x
+ 2
y
if
x
= 3 and
y
= 7.
A.
105
B.
5
C.
23
D.
27
Hint
2.
Evaluate
if
a
= 5,
b
= 6 and
c
= 3.
A.
10
B.
C.
30
D.
3
Hint
3.
Evaluate 7 × (
a
- 4) if
a
= 9.
A.
63
B.
35
C.
28
D.
59
Hint
4.
Evaluate 5
k
+
if
k
= 3,
m
= 20, and
n
. = 5.
A.
7
B.
19
C.
20
D.
57
Hint
5.
In physics, the number
measures the force of gravity between two objects when
a
and
b
each stand for the mass one of the objects and
d
stands for the distance between them. Find the force of gravity when
a
= 5,
b
= 8, and
d
= 2.
A.
10
B.
40
C.
20
D.
5
Hint