70. The length of a rectangle is 18 inches less than five times its width. Its area is 35 square
inches. Find the dimensions of the rectangle.
71. A diver jumps from a diving board that is 144 feet above the water. The height h (in feet) of
=
−
+
the diver is modeled by the position equation
. Where t is time measured in
2
h
16
t
144
seconds. How long will it take for the diver to reach the water?
72. A ladder is leaning against a building so that the distance from the ground to the top of the
ladder is 8 feet less than the length of the ladder. Find the length of the ladder if the distance
from the bottom of the ladder to the building is 16 feet.
Elementary Algebra Answer Key
21
5
1.
o 2
r
8
8
2.
118
3.
3
4.
2
5.
13
4
6.
2
19
7.
13
1
8.
10
2
6
4
9.
4
6
10.
7
5
11. 19
12. ‐16
1
13.
5
−
3
2
1
5
11
14. a.
b. 3 c.
d.
,
e.
2
3
4
2
4
+
3
x
6
15. y=
5
x
7 +
c
2
16. b=
4
a
+
160
9
C
17. F=
5
18. 19
19. 150
%
20. 14
21. 72,
144, 29
−
5
≥
22. x
3
≤
23. 4<
x
5