# Algebraic Expressions: Don't Circumvent Circumferences Quiz

Think you’ve got your head wrapped around Algebraic Expressions? Put your knowledge to the test. Good luck — the Stickman is counting on you!
Q. Which of the following is NOT an appropriate way to abbreviate "z times 7"?

z × 7
(z)(7)
z · 7
z
None of the above
Q. The circumference of a circle is given by the formula C = 2πr. Which of the following is/are the variable(s) in this formula?

C, r
π, C
π, r
π
None of the above
Q. The circumference of a circle is given by the formula C = 2πr. Which of the following is/are the constant(s) in this formula?

C, r
π, C
π, r
2, π
None of the above
Q. The circumference of a circle is given by the formula C = 2πr. Which is/are the independent variable(s) in this formula?

C
r
π
π, r
None of the above
Q. Which of the following are the terms in the expression ax2 + bx - c?

ax2, bx2, and c
ax2, bx, and - c
ax2 and bx - c
ax2 + bx and - c
None of the above
Q. A formula is a particular type of

term
expression
equation
factor
None of the above
Q. Evaluate the expression 3 + xx2x3 for x = ( - 3).

- 18
18
- 36
36
None of the above
Q. Evaluate the expression 25 - xy + x - y3 for x = 3 and y = - 2.

20
32
36
42
None of the above
Q. The area of a trapezoid is given by the formula , where a is the altitude of the trapezoid—so be sure to bring your inhaler if you plan on climbing to the top of it—and b1 and b2 are the bases of the trapezoid. What is the area of the trapezoid shown below?

24
20
12
10
None of the above
Q. Annie wants to donate 5% of her income to charity. Well, she doesn't especially want to, but she's heard that she'll receive a nice tax break if she does. Let I be Annie's income, and let be the amount Annie donates to charity. Which of the following formulas best expresses the relationship between I and C?

C = 5I
C = 0.05I
I = 0.05C
I = 5C
None of the above