Use the given property of multiplication to rewrite each statement. Commutative property: 16 ? 9 = _____
A. 16 ? 9
B. 16 + 9
C. 9 ? 16
D. 9 + 
Answer: C
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Write the complex number in trigonometric form, using degree measure for the argument.4
A. 4(cos 90° + i sin 90°) B. 4(cos 270° + i sin 270°) C. 4(cos 180° + i sin 180°) D. 4(cos 0° + i sin 0°)
Give the equation of the horizontal asymptote, if any, of the function.h(x) = 
A. y = 5 B. y = 0 C. y = 9 D. no horizontal asymptotes
Determine whether the following is a difference of squares.x2 - 144
A. Yes B. No
Solve the problem.The surface area of a balloon is given by S(r) = 4?r2, where r is the radius of the balloon. If the radius is increasing with time t, as the balloon is being blown up, according to the formula 
find the surface area S as a function of the time t.
A. S(r(t)) = 
?t6
B. S(r(t)) = 
?t9
C. S(r(t)) = 
?t3
D. S(r(t)) = 
?t6