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)

None of the above

Q. The circumference of a circle is given by the formula *C* = 2 π *r*. Which of the following is/are the variable(s) in this formula?

π, *C*

π, *r*

π

None of the above

Q. The circumference of a circle is given by the formula *C* = 2 π *r*. Which of the following is/are the constant(s) in this formula?

π, *C*

π, *r*

2, π

None of the above

Q. The circumference of a circle is given by the formula *C* = 2 π *r*. Which is/are the independent variable(s) in this formula?

π

π, *r*

None of the above

Q. Which of the following are the terms in the expression *ax*^{2} + *bx* -* 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 + *x* - *x*^{2} - *x*^{3} for *x* = ( - 3).

- 18

18

- 36

36

None of the above

Q. Evaluate the expression 25 - *xy* + *x* - *y*^{3} 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 *b*_{1} and *b*_{2} 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 has heard that she will receive a nice tax break if she does. Let *I* be Annie's income, and let *C *be the amount Annie donates to charity. Which of the following formulas best expresses the relationship between *I* and *C*?

None of the above