1.
Evaluate 3
x
+ 2
y
if
x
= 3 and
y
= 7.
A.
27
B.
105
C.
5
D.
23
Hint
2.
Evaluate
if
a
= 5,
b
= 6 and
c
= 3.
A.
3
B.
30
C.
D.
10
Hint
3.
The equation
where
d
represents the distance in miles
and
t
is the number of seconds between seeing lightening and
hearing thunder, tells how far away a thunderstorm is.
How far is it to a thunderstorm if you count 15 seconds between
seeing the lightening and hearing the thunder?
A.
1 mile
B.
3 miles
C.
15 miles
D.
10 miles
Hint
4.
Evaluate
a
b
+ 8 if
a
= 4 and
b
= 7
A.
28
B.
55
C.
36
D.
60
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.
20
B.
5
C.
40
D.
10
Hint