Express the statement as an equation involving the indicated variables.The surface area S of a sphere is 4 times ? times the square of the radius r.
A. S = ?r2
B. S = 4?r2
C. S = 4? 
D. S = 4?r
Answer: B
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Determine whether the sentence is a statement.Do you like this color?
A. statement B. not a statement
The demand equation is 
.
?
Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at 
.
?
A. 6; elastic
B. 
; inelastic
C. 5; elastic
D. 
;elastic
Mark as true any statement that is always true. Mark as false any statement that is never true or that is not necessarily true. Be able to justify your answers.
1. If the x-coordinate of P is positive and the y-coordinate of P is negative, then P is in Quadrant IV. 2. If AB = ?7, BC = ?3, and AC = ?10 , then A, B, and C are collinear. 3. If M(a, b) is the midpoint of for A(c, d), then B has coordinates (2a–c, 2b–d). 4. If the slopes of two different lines are undefined, then the lines are parallel. 5. If the slope of a line is m, then the slope of any perpendicular line is -1/m.
Evaluate the exponential expression. Write the answer as an improper fraction where appropriate.
2
A. 
B. 
C. 
D. 