Multiply. Leave the answer in trigonometric form.
?
What will be an ideal response?
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Describe the given set of points with a single equation or with a pair of equations.The circle of radius 2 centered at the point (0, -9, 8) and lying in a plane perpendicular to the 
A. 
2+ 
2+ 1 = 22
B. 
2 + 
2 = 22 and x = 0
C. (y + 9)2 + (z - 8)2 = 22 and x = 0
D. (y + 9)2 + (z - 8)2 = 22 and y + z = -1
Decide whether the problem is an equation or an expression.4x + 7 = 
A. Expression B. Equation
Find the indicated limit.
A. 3 B. 0 C. 1 D. -?
Solve the problem.The level of a sound in decibels (db) is determined by the formula 
where I is the intensity of the sound in watts per square meter. What is the intensity of a noise measured at 53 db? Express the answer in scientific notation, rounded to two decimal places.
A. 2.00 × 10-7 watt/m2 B. 2.00 × 1014 watt/m2 C. 5.30 × 10-10 watt/m2 D. 2.00 × 10-6 watt/m2