What is the length of side s of the square shown below? 450
S
90°
O
A. 2-3
B. 1
0
O
C. 2
a
D. 4
E. 3
o
F. 42

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The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?