1.
Find (4
x
2
+ 3
x
) + (7
x
2
– 5
x
– 6).
A.
11
x
4
– 2
x
2
– 6
B.
11
x
2
– 8
x
– 6
C.
11
x
2
– 2
x
– 6
D.
9
x
– 6
Hint
2.
Find the sum (4
xy
2
– 3
x
2
y
– 5
xy
– 6) + (-5
xy
2
– 2
xy
+ 3).
A.
4
xy
2
– 8
x
2
y
– 7
xy
– 3
B.
4
xy
2
– 7
xy
– 3
C.
-
xy
2
– 3
x
2
y
– 3
xy
– 3
D.
-
xy
2
– 3
x
2
y
– 7
xy
– 3
Hint
3.
Find (–2
x
2
+ 5
x
– 1) – (3
x
2
– 4
x
– 6).
A.
–5
x
2
+ 9
x
+ 5
B.
–5
x
2
+
x
+ 5
C.
–5
x
2
+ 9
x
– 7
D.
–5
x
2
+
x
– 7
Hint
4.
Anthony and Sanford each throw a football. The height of Anthony's throw can represented by the equation
A
= –10
x
2
+ 15
x
+ 22, where
A
is height and
x
is the time in seconds. The height of Sanford's throw can represented by the equation
S
= –9
x
2
+ 14
x
+ 23. At time
x
, how much higher is Sanford's throw?
A.
x
2
–
x
+ 1
B.
x
2
+
x
+ 1
C.
x
2
+
x
– 1
D.
x
2
–
x
– 1
Hint
5.
Suppose the perimeter of a triangle is given by
P
= 13
x
+ 5
y
, and two of its sides have lengths of 2
x
+
y
and 8
x
+ 4
y
. What is the length of the third side?
A.
23
x
+ 5
y
B.
6
x
+ 3
y
C.
3
x
+
y
D.
3
x
Hint