# Algebraic Expressions: Don't Circumvent Circumferences Quiz

Think you’ve got your head wrapped around

*? Put your knowledge to the test. Good luck — the Stickman is counting on you!***Algebraic Expressions**Q. Which of the following is NOT an appropriate way to abbreviate "

*z*times 7"?*z*× 7

(

*z*)(7)*z*· 7

*z*7

None of the above

Q. The circumference of a circle is given by the formula

*C*= 2π*r*. 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*= 2π*r*. 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*= 2π*r*. 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

*ax*^{2}+*bx*-*c*?*ax*

^{2}

*, bx*

^{2}

*,*and

*c*

*ax*

^{2},

*bx*, and -

*c*

*ax*

^{2}and

*bx*-

*c*

*ax*

^{2}+

*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 +

*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's heard that she'll 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*?*C*= 5

*I*

*C*= 0.05

*I*

*I*= 0.05

*C*

*I*= 5

*C*

None of the above