18. Which of the following is an example of an algebraic expression? A. 10x + 2 B. 10x > 2 C. 10x + 2 <3 3 D. 10x + 2 =4

19 The cost of equipment A, B, and C are 2x2 + 3x - 5, -8x2 + 42 and 18x2 - 4x - 9 respectively. What is the total cost
three equipment?
A. 12x2 --X + 28 B. 12x2 + x + 28 C. 12x2 - X - 28 D. 12x2 + X-28

20. Which mathematical statement is correct?
A. (x-4)2 = x2 --- 8x + 16
=
B. (x+4)= x2 + 4x + 16
+
C.(x-3)3 = x 3 + 3x + 27
D. (x+3)3 = x 3 + 3x - 27​